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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 "gtest/gtest.h"
11 #include "llvm/Support/Endian.h"
12 #include "llvm/Support/DataTypes.h"
13 #include <cstdlib>
14 #include <ctime>
15 using namespace llvm;
16 using namespace support;
17 
18 #undef max
19 
20 namespace {
21 
TEST(Endian,Read)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 big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
25   unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
26   int32_t BigAsHost = 0x00010203;
27   EXPECT_EQ(BigAsHost, (endian::read_be<int32_t, unaligned>(big)));
28   int32_t LittleAsHost = 0x02030400;
29   EXPECT_EQ(LittleAsHost, (endian::read_le<int32_t, unaligned>(little)));
30 
31   EXPECT_EQ((endian::read_be<int32_t, unaligned>(big + 1)),
32             (endian::read_le<int32_t, unaligned>(little + 1)));
33 }
34 
TEST(Endian,Write)35 TEST(Endian, Write) {
36   unsigned char data[5];
37   endian::write_be<int32_t, 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_be<int32_t, 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_le<int32_t, 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_le<int32_t, 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 
TEST(Endian,PackedEndianSpecificIntegral)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 }
73