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Diffstat (limited to 'src/base/bituniontest.cc')
| -rw-r--r-- | src/base/bituniontest.cc | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/base/bituniontest.cc b/src/base/bituniontest.cc new file mode 100644 index 000000000..1f24e7e66 --- /dev/null +++ b/src/base/bituniontest.cc @@ -0,0 +1,194 @@ +/* + * Copyright 2014 Google, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Gabe Black + */ + +#include <gtest/gtest.h> + +#include <cassert> +#include <iostream> + +#include "base/bitunion.hh" +#include "base/cprintf.hh" + +using namespace std; + +namespace { + +BitUnion64(SixtyFour) + Bitfield<39, 32> byte5; + Bitfield<2> bit2; + BitfieldRO<39, 32> byte5RO; + BitfieldWO<39, 32> byte5WO; + SubBitUnion(byte6, 47, 40) + Bitfield<43, 42> bits43To42; + Bitfield<41> bit41; + SignedBitfield<41> bit41Signed; + EndSubBitUnion(byte6) + SignedBitfield<47, 40> byte6Signed; + SignedBitfieldRO<47, 40> byte6SignedRO; + SignedBitfieldWO<47, 40> byte6SignedWO; +EndBitUnion(SixtyFour) + +BitUnion64(EmptySixtyFour) +EndBitUnion(EmptySixtyFour) + +BitUnion32(EmptyThirtyTwo) +EndBitUnion(EmptyThirtyTwo) + +BitUnion16(EmptySixteen) +EndBitUnion(EmptySixteen) + +BitUnion8(EmptyEight) +EndBitUnion(EmptyEight) + +struct ContainingStruct +{ + BitUnion64(Contained) + Bitfield<63, 60> topNibble; + EndBitUnion(Contained) + + Contained contained; +}; + +uint64_t +containingFunc(uint64_t init_val, uint64_t fieldVal) +{ + BitUnion32(Contained) + Bitfield<16, 15> field; + EndBitUnion(Contained) + + Contained contained = init_val; + contained.field = fieldVal; + return contained; +} + +} // anonymous namespace + +// Declare these as global so g++ doesn't ignore them. Initialize them in +// various ways. +EmptySixtyFour emptySixtyFour = 0; +EmptyThirtyTwo emptyThirtyTwo; +EmptySixteen emptySixteen; +EmptyEight emptyEight(0); + +class BitUnionData : public testing::Test { + protected: + SixtyFour sixtyFour; + + void SetUp() override { sixtyFour = 0; } +}; + +TEST_F(BitUnionData, NormalBitfield) +{ + EXPECT_EQ(sixtyFour.byte5, 0); + sixtyFour.byte5 = 0xff; + EXPECT_EQ(sixtyFour, 0xff00000000); + sixtyFour.byte5 = 0xfff; + EXPECT_EQ(sixtyFour, 0xff00000000); + EXPECT_EQ(sixtyFour.byte5, 0xff); +} + +TEST_F(BitUnionData, SingleBitfield) +{ + EXPECT_EQ(sixtyFour.bit2, 0); + sixtyFour.bit2 = 0x1; + EXPECT_EQ(sixtyFour, 0x4); + EXPECT_EQ(sixtyFour.bit2, 0x1); +} + +TEST_F(BitUnionData, ReadOnlyBitfield) +{ + EXPECT_EQ(sixtyFour.byte5RO, 0); + sixtyFour.byte5 = 0xff; + EXPECT_EQ(sixtyFour.byte5RO, 0xff); +} + +TEST_F(BitUnionData, WriteOnlyBitfield) +{ + sixtyFour.byte5WO = 0xff; + EXPECT_EQ(sixtyFour, 0xff00000000); +} + +TEST_F(BitUnionData, SubBitUnions) +{ + EXPECT_EQ(sixtyFour.byte6.bit41, 0); + sixtyFour.byte6 = 0x2; + EXPECT_EQ(sixtyFour.byte6.bit41, 1); + sixtyFour.byte6.bits43To42 = 0x3; + EXPECT_EQ(sixtyFour.byte6, 0xe); + sixtyFour.byte6 = 0xff; + sixtyFour.byte6.bit41 = 0; + EXPECT_EQ(sixtyFour, 0xfd0000000000); +} + +TEST_F(BitUnionData, SignedBitfields) +{ + sixtyFour.byte6 = 0xff; + EXPECT_EQ(sixtyFour.byte6Signed, -1); + EXPECT_EQ(sixtyFour.byte6SignedRO, -1); + sixtyFour.byte6SignedWO = 0; + EXPECT_EQ(sixtyFour.byte6Signed, 0); + EXPECT_EQ(sixtyFour.byte6SignedRO, 0); + EXPECT_EQ(sixtyFour.byte6, 0); +} + +TEST_F(BitUnionData, InsideStruct) +{ + ContainingStruct containing; + containing.contained = 0; + containing.contained.topNibble = 0xd; + EXPECT_EQ(containing.contained, 0xd000000000000000); +} + +TEST_F(BitUnionData, InsideFunction) +{ + EXPECT_EQ(containingFunc(0xfffff, 0), 0xe7fff); +} + +TEST_F(BitUnionData, BitfieldToBitfieldAssignment) +{ + SixtyFour otherSixtyFour = 0; + sixtyFour.bit2 = 1; + otherSixtyFour.byte6.bit41 = sixtyFour.bit2; + EXPECT_EQ(otherSixtyFour, 0x20000000000); + otherSixtyFour.bit2 = sixtyFour.bit2; + EXPECT_EQ(otherSixtyFour, 0x20000000004); +} + +TEST_F(BitUnionData, Operators) +{ + SixtyFour otherSixtyFour = 0x4; + sixtyFour = otherSixtyFour; + EXPECT_EQ(sixtyFour, 0x4); + sixtyFour = 0; + EXPECT_TRUE(sixtyFour < otherSixtyFour); + EXPECT_TRUE(otherSixtyFour > sixtyFour); + EXPECT_TRUE(sixtyFour != otherSixtyFour); + sixtyFour = otherSixtyFour; + EXPECT_TRUE(sixtyFour == otherSixtyFour); +} |