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
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 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
TEST(Endian,ReadBitAligned)35 TEST(Endian, ReadBitAligned) {
36 // Simple test to make sure we properly pull out the 0x0 word.
37 unsigned char littleval[] = {0x3f, 0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff};
38 unsigned char bigval[] = {0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xc0};
39 EXPECT_EQ(
40 (endian::readAtBitAlignment<int, little, unaligned>(&littleval[0], 6)),
41 0x0);
42 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval[0], 6)),
43 0x0);
44 // Test to make sure that signed right shift of 0xf0000000 is masked
45 // properly.
46 unsigned char littleval2[] = {0x00, 0x00, 0x00, 0xf0, 0x00, 0x00, 0x00, 0x00};
47 unsigned char bigval2[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
48 EXPECT_EQ(
49 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 4)),
50 0x0f000000);
51 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 4)),
52 0x0f000000);
53 // Test to make sure left shift of start bit doesn't overflow.
54 EXPECT_EQ(
55 (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 1)),
56 0x78000000);
57 EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 1)),
58 0x78000000);
59 // Test to make sure 64-bit int doesn't overflow.
60 unsigned char littleval3[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0,
61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
62 unsigned char bigval3[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
64 EXPECT_EQ((endian::readAtBitAlignment<int64_t, little, unaligned>(
65 &littleval3[0], 4)),
66 0x0f00000000000000);
67 EXPECT_EQ(
68 (endian::readAtBitAlignment<int64_t, big, unaligned>(&bigval3[0], 4)),
69 0x0f00000000000000);
70 }
71
TEST(Endian,WriteBitAligned)72 TEST(Endian, WriteBitAligned) {
73 // This test ensures that signed right shift of 0xffffaa is masked
74 // properly.
75 unsigned char bigval[8] = {0x00};
76 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval, (int)0xffffaaaa,
77 4);
78 EXPECT_EQ(bigval[0], 0xff);
79 EXPECT_EQ(bigval[1], 0xfa);
80 EXPECT_EQ(bigval[2], 0xaa);
81 EXPECT_EQ(bigval[3], 0xa0);
82 EXPECT_EQ(bigval[4], 0x00);
83 EXPECT_EQ(bigval[5], 0x00);
84 EXPECT_EQ(bigval[6], 0x00);
85 EXPECT_EQ(bigval[7], 0x0f);
86
87 unsigned char littleval[8] = {0x00};
88 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval,
89 (int)0xffffaaaa, 4);
90 EXPECT_EQ(littleval[0], 0xa0);
91 EXPECT_EQ(littleval[1], 0xaa);
92 EXPECT_EQ(littleval[2], 0xfa);
93 EXPECT_EQ(littleval[3], 0xff);
94 EXPECT_EQ(littleval[4], 0x0f);
95 EXPECT_EQ(littleval[5], 0x00);
96 EXPECT_EQ(littleval[6], 0x00);
97 EXPECT_EQ(littleval[7], 0x00);
98
99 // This test makes sure 1<<31 doesn't overflow.
100 // Test to make sure left shift of start bit doesn't overflow.
101 unsigned char bigval2[8] = {0x00};
102 endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval2, (int)0xffffffff,
103 1);
104 EXPECT_EQ(bigval2[0], 0xff);
105 EXPECT_EQ(bigval2[1], 0xff);
106 EXPECT_EQ(bigval2[2], 0xff);
107 EXPECT_EQ(bigval2[3], 0xfe);
108 EXPECT_EQ(bigval2[4], 0x00);
109 EXPECT_EQ(bigval2[5], 0x00);
110 EXPECT_EQ(bigval2[6], 0x00);
111 EXPECT_EQ(bigval2[7], 0x01);
112
113 unsigned char littleval2[8] = {0x00};
114 endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval2,
115 (int)0xffffffff, 1);
116 EXPECT_EQ(littleval2[0], 0xfe);
117 EXPECT_EQ(littleval2[1], 0xff);
118 EXPECT_EQ(littleval2[2], 0xff);
119 EXPECT_EQ(littleval2[3], 0xff);
120 EXPECT_EQ(littleval2[4], 0x01);
121 EXPECT_EQ(littleval2[5], 0x00);
122 EXPECT_EQ(littleval2[6], 0x00);
123 EXPECT_EQ(littleval2[7], 0x00);
124
125 // Test to make sure 64-bit int doesn't overflow.
126 unsigned char bigval64[16] = {0x00};
127 endian::writeAtBitAlignment<int64_t, big, unaligned>(
128 bigval64, (int64_t)0xffffffffffffffff, 1);
129 EXPECT_EQ(bigval64[0], 0xff);
130 EXPECT_EQ(bigval64[1], 0xff);
131 EXPECT_EQ(bigval64[2], 0xff);
132 EXPECT_EQ(bigval64[3], 0xff);
133 EXPECT_EQ(bigval64[4], 0xff);
134 EXPECT_EQ(bigval64[5], 0xff);
135 EXPECT_EQ(bigval64[6], 0xff);
136 EXPECT_EQ(bigval64[7], 0xfe);
137 EXPECT_EQ(bigval64[8], 0x00);
138 EXPECT_EQ(bigval64[9], 0x00);
139 EXPECT_EQ(bigval64[10], 0x00);
140 EXPECT_EQ(bigval64[11], 0x00);
141 EXPECT_EQ(bigval64[12], 0x00);
142 EXPECT_EQ(bigval64[13], 0x00);
143 EXPECT_EQ(bigval64[14], 0x00);
144 EXPECT_EQ(bigval64[15], 0x01);
145
146 unsigned char littleval64[16] = {0x00};
147 endian::writeAtBitAlignment<int64_t, little, unaligned>(
148 littleval64, (int64_t)0xffffffffffffffff, 1);
149 EXPECT_EQ(littleval64[0], 0xfe);
150 EXPECT_EQ(littleval64[1], 0xff);
151 EXPECT_EQ(littleval64[2], 0xff);
152 EXPECT_EQ(littleval64[3], 0xff);
153 EXPECT_EQ(littleval64[4], 0xff);
154 EXPECT_EQ(littleval64[5], 0xff);
155 EXPECT_EQ(littleval64[6], 0xff);
156 EXPECT_EQ(littleval64[7], 0xff);
157 EXPECT_EQ(littleval64[8], 0x01);
158 EXPECT_EQ(littleval64[9], 0x00);
159 EXPECT_EQ(littleval64[10], 0x00);
160 EXPECT_EQ(littleval64[11], 0x00);
161 EXPECT_EQ(littleval64[12], 0x00);
162 EXPECT_EQ(littleval64[13], 0x00);
163 EXPECT_EQ(littleval64[14], 0x00);
164 EXPECT_EQ(littleval64[15], 0x00);
165 }
166
TEST(Endian,Write)167 TEST(Endian, Write) {
168 unsigned char data[5];
169 endian::write<int32_t, big, unaligned>(data, -1362446643);
170 EXPECT_EQ(data[0], 0xAE);
171 EXPECT_EQ(data[1], 0xCA);
172 EXPECT_EQ(data[2], 0xB6);
173 EXPECT_EQ(data[3], 0xCD);
174 endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
175 EXPECT_EQ(data[1], 0xAE);
176 EXPECT_EQ(data[2], 0xCA);
177 EXPECT_EQ(data[3], 0xB6);
178 EXPECT_EQ(data[4], 0xCD);
179
180 endian::write<int32_t, little, unaligned>(data, -1362446643);
181 EXPECT_EQ(data[0], 0xCD);
182 EXPECT_EQ(data[1], 0xB6);
183 EXPECT_EQ(data[2], 0xCA);
184 EXPECT_EQ(data[3], 0xAE);
185 endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
186 EXPECT_EQ(data[1], 0xCD);
187 EXPECT_EQ(data[2], 0xB6);
188 EXPECT_EQ(data[3], 0xCA);
189 EXPECT_EQ(data[4], 0xAE);
190 }
191
TEST(Endian,PackedEndianSpecificIntegral)192 TEST(Endian, PackedEndianSpecificIntegral) {
193 // These are 5 bytes so we can be sure at least one of the reads is unaligned.
194 unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
195 unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
196 big32_t *big_val =
197 reinterpret_cast<big32_t *>(big + 1);
198 little32_t *little_val =
199 reinterpret_cast<little32_t *>(little + 1);
200
201 EXPECT_EQ(*big_val, *little_val);
202 }
203
204 } // end anon namespace
205