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8e9968e6f2
* Add support for specifying the alignment to use. * Add the concept of native endianness. Used for unaligned native types. The native alignment and read/write simplification is based on a patch by Richard Smith. llvm-svn: 171406
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
//===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/DataTypes.h"
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#include "gtest/gtest.h"
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#include <cstdlib>
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#include <ctime>
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using namespace llvm;
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using namespace support;
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#undef max
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namespace {
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TEST(Endian, Read) {
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// These are 5 bytes so we can be sure at least one of the reads is unaligned.
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unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04};
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unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01};
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int32_t BigAsHost = 0x00010203;
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EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval)));
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int32_t LittleAsHost = 0x02030400;
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EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval)));
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EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)),
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(endian::read<int32_t, little, unaligned>(littleval + 1)));
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}
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TEST(Endian, Write) {
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unsigned char data[5];
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endian::write<int32_t, big, unaligned>(data, -1362446643);
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EXPECT_EQ(data[0], 0xAE);
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EXPECT_EQ(data[1], 0xCA);
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EXPECT_EQ(data[2], 0xB6);
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EXPECT_EQ(data[3], 0xCD);
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endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
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EXPECT_EQ(data[1], 0xAE);
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EXPECT_EQ(data[2], 0xCA);
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EXPECT_EQ(data[3], 0xB6);
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EXPECT_EQ(data[4], 0xCD);
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endian::write<int32_t, little, unaligned>(data, -1362446643);
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EXPECT_EQ(data[0], 0xCD);
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EXPECT_EQ(data[1], 0xB6);
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EXPECT_EQ(data[2], 0xCA);
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EXPECT_EQ(data[3], 0xAE);
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endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
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EXPECT_EQ(data[1], 0xCD);
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EXPECT_EQ(data[2], 0xB6);
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EXPECT_EQ(data[3], 0xCA);
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EXPECT_EQ(data[4], 0xAE);
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}
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TEST(Endian, PackedEndianSpecificIntegral) {
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// These are 5 bytes so we can be sure at least one of the reads is unaligned.
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unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
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unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
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big32_t *big_val =
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reinterpret_cast<big32_t *>(big + 1);
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little32_t *little_val =
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reinterpret_cast<little32_t *>(little + 1);
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EXPECT_EQ(*big_val, *little_val);
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}
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} // end anon namespace
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