183 lines
5.4 KiB
C++
183 lines
5.4 KiB
C++
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/*
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* Copyright 2014 Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Gabe Black
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*/
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#include <cassert>
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#include <iostream>
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#include "base/bitunion.hh"
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#include "base/cprintf.hh"
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#include "unittest/unittest.hh"
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using namespace std;
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using UnitTest::setCase;
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namespace {
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BitUnion64(SixtyFour)
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Bitfield<39, 32> byte5;
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Bitfield<2> bit2;
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BitfieldRO<39, 32> byte5RO;
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BitfieldWO<39, 32> byte5WO;
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SubBitUnion(byte6, 47, 40)
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Bitfield<43, 42> bits43To42;
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Bitfield<41> bit41;
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SignedBitfield<41> bit41Signed;
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EndSubBitUnion(byte6)
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SignedBitfield<47, 40> byte6Signed;
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SignedBitfieldRO<47, 40> byte6SignedRO;
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SignedBitfieldWO<47, 40> byte6SignedWO;
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EndBitUnion(SixtyFour)
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BitUnion64(EmptySixtyFour)
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EndBitUnion(EmptySixtyFour)
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BitUnion32(EmptyThirtyTwo)
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EndBitUnion(EmptyThirtyTwo)
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BitUnion16(EmptySixteen)
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EndBitUnion(EmptySixteen)
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BitUnion8(EmptyEight)
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EndBitUnion(EmptyEight)
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struct ContainingStruct
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{
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BitUnion64(Contained)
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Bitfield<63, 60> topNibble;
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EndBitUnion(Contained)
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Contained contained;
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};
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uint64_t
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containingFunc(uint64_t init_val, uint64_t fieldVal)
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{
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BitUnion32(Contained)
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Bitfield<16, 15> field;
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EndBitUnion(Contained)
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Contained contained = init_val;
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contained.field = fieldVal;
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return contained;
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}
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} // anonymous namespace
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// Declare these as global so g++ doesn't ignore them. Initialize them in
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// various ways.
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EmptySixtyFour emptySixtyFour = 0;
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EmptyThirtyTwo emptyThirtyTwo;
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EmptySixteen emptySixteen;
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EmptyEight emptyEight(0);
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int
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main()
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{
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SixtyFour sixtyFour = 0;
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setCase("normal bitfield");
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EXPECT_EQ(sixtyFour.byte5, 0);
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sixtyFour.byte5 = 0xff;
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EXPECT_EQ(sixtyFour, 0xff00000000);
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sixtyFour.byte5 = 0xfff;
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EXPECT_EQ(sixtyFour, 0xff00000000);
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EXPECT_EQ(sixtyFour.byte5, 0xff);
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sixtyFour = 0;
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setCase("single bitfield");
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EXPECT_EQ(sixtyFour.bit2, 0);
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sixtyFour.bit2 = 0x1;
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EXPECT_EQ(sixtyFour, 0x4);
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EXPECT_EQ(sixtyFour.bit2, 0x1);
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sixtyFour = 0;
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setCase("read only bitfield");
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EXPECT_EQ(sixtyFour.byte5RO, 0);
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sixtyFour.byte5 = 0xff;
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EXPECT_EQ(sixtyFour.byte5RO, 0xff);
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sixtyFour = 0;
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setCase("write only bitfield");
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sixtyFour.byte5WO = 0xff;
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EXPECT_EQ(sixtyFour, 0xff00000000);
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sixtyFour = 0;
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setCase("sub bitunions and their bitfields");
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EXPECT_EQ(sixtyFour.byte6.bit41, 0);
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sixtyFour.byte6 = 0x2;
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EXPECT_EQ(sixtyFour.byte6.bit41, 1);
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sixtyFour.byte6.bits43To42 = 0x3;
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EXPECT_EQ(sixtyFour.byte6, 0xe);
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sixtyFour.byte6 = 0xff;
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sixtyFour.byte6.bit41 = 0;
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EXPECT_EQ(sixtyFour, 0xfd0000000000);
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sixtyFour = 0;
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setCase("normal, read only, and write only signed bitfields");
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sixtyFour.byte6 = 0xff;
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EXPECT_EQ(sixtyFour.byte6Signed, -1);
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EXPECT_EQ(sixtyFour.byte6SignedRO, -1);
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sixtyFour.byte6SignedWO = 0;
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EXPECT_EQ(sixtyFour.byte6Signed, 0);
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EXPECT_EQ(sixtyFour.byte6SignedRO, 0);
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EXPECT_EQ(sixtyFour.byte6, 0);
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sixtyFour = 0;
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setCase("bitunion declared inside a struct");
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ContainingStruct containing;
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containing.contained = 0;
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containing.contained.topNibble = 0xd;
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EXPECT_EQ(containing.contained, 0xd000000000000000);
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setCase("bitunion declared inside a function");
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EXPECT_EQ(containingFunc(0xfffff, 0), 0xe7fff);
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setCase("assigning bitfields to other bitfields");
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SixtyFour otherSixtyFour = 0;
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sixtyFour.bit2 = 1;
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otherSixtyFour.byte6.bit41 = sixtyFour.bit2;
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EXPECT_EQ(otherSixtyFour, 0x20000000000);
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otherSixtyFour.bit2 = sixtyFour.bit2;
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EXPECT_EQ(otherSixtyFour, 0x20000000004);
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setCase("bitunion operators");
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sixtyFour = 0;
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otherSixtyFour = 0x4;
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sixtyFour = otherSixtyFour;
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EXPECT_EQ(sixtyFour, 0x4);
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sixtyFour = 0;
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EXPECT_TRUE(sixtyFour < otherSixtyFour);
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EXPECT_TRUE(otherSixtyFour > sixtyFour);
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EXPECT_TRUE(sixtyFour != otherSixtyFour);
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sixtyFour = otherSixtyFour;
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EXPECT_TRUE(sixtyFour == otherSixtyFour);
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return UnitTest::printResults();
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}
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