unittests/Support/EndianTest.cpp

   1 //===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/Endian.h"
  11 #include "llvm/Support/DataTypes.h"
  12 #include "gtest/gtest.h"
  13 #include <cstdlib>
  14 #include <ctime>
  15 using namespace llvm;
  16 using namespace support;
  17
  18 #undef max
  19
  20 namespace {
  21
  22 TEST(Endian, Read) {
  23   // These are 5 bytes so we can be sure at least one of the reads is unaligned.
  24   unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04};
  25   unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01};
  26   int32_t BigAsHost = 0x00010203;
  27   EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval)));
  28   int32_t LittleAsHost = 0x02030400;
  29   EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval)));
  30
  31   EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)),
  32             (endian::read<int32_t, little, unaligned>(littleval + 1)));
  33 }
  34
  35 TEST(Endian, Write) {
  36   unsigned char data[5];
  37   endian::write<int32_t, big, unaligned>(data, -1362446643);
  38   EXPECT_EQ(data[0], 0xAE);
  39   EXPECT_EQ(data[1], 0xCA);
  40   EXPECT_EQ(data[2], 0xB6);
  41   EXPECT_EQ(data[3], 0xCD);
  42   endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
  43   EXPECT_EQ(data[1], 0xAE);
  44   EXPECT_EQ(data[2], 0xCA);
  45   EXPECT_EQ(data[3], 0xB6);
  46   EXPECT_EQ(data[4], 0xCD);
  47
  48   endian::write<int32_t, little, unaligned>(data, -1362446643);
  49   EXPECT_EQ(data[0], 0xCD);
  50   EXPECT_EQ(data[1], 0xB6);
  51   EXPECT_EQ(data[2], 0xCA);
  52   EXPECT_EQ(data[3], 0xAE);
  53   endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
  54   EXPECT_EQ(data[1], 0xCD);
  55   EXPECT_EQ(data[2], 0xB6);
  56   EXPECT_EQ(data[3], 0xCA);
  57   EXPECT_EQ(data[4], 0xAE);
  58 }
  59
  60 TEST(Endian, PackedEndianSpecificIntegral) {
  61   // These are 5 bytes so we can be sure at least one of the reads is unaligned.
  62   unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
  63   unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
  64   big32_t    *big_val    =
  65     reinterpret_cast<big32_t *>(big + 1);
  66   little32_t *little_val =
  67     reinterpret_cast<little32_t *>(little + 1);
  68
  69   EXPECT_EQ(*big_val, *little_val);
  70 }
  71
  72 } // end anon namespace