1 //===- llvm/unittest/Support/LEB128Test.cpp - LEB128 function 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/DataTypes.h" 12 #include "llvm/Support/LEB128.h" 13 #include "llvm/Support/raw_ostream.h" 14 #include <string> 15 using namespace llvm; 16 17 namespace { 18 19 TEST(LEB128Test, EncodeSLEB128) { 20 #define EXPECT_SLEB128_EQ(EXPECTED, VALUE) \ 21 do { \ 22 /* encodeSLEB128(uint64_t, raw_ostream &) */ \ 23 std::string Expected(EXPECTED, sizeof(EXPECTED) - 1); \ 24 std::string Actual; \ 25 raw_string_ostream Stream(Actual); \ 26 encodeSLEB128(VALUE, Stream); \ 27 Stream.flush(); \ 28 EXPECT_EQ(Expected, Actual); \ 29 } while (0) 30 31 // Encode SLEB128 32 EXPECT_SLEB128_EQ("\x00", 0); 33 EXPECT_SLEB128_EQ("\x01", 1); 34 EXPECT_SLEB128_EQ("\x7f", -1); 35 EXPECT_SLEB128_EQ("\x3f", 63); 36 EXPECT_SLEB128_EQ("\x41", -63); 37 EXPECT_SLEB128_EQ("\x40", -64); 38 EXPECT_SLEB128_EQ("\xbf\x7f", -65); 39 EXPECT_SLEB128_EQ("\xc0\x00", 64); 40 41 #undef EXPECT_SLEB128_EQ 42 } 43 44 TEST(LEB128Test, EncodeULEB128) { 45 #define EXPECT_ULEB128_EQ(EXPECTED, VALUE, PAD) \ 46 do { \ 47 std::string Expected(EXPECTED, sizeof(EXPECTED) - 1); \ 48 \ 49 /* encodeULEB128(uint64_t, raw_ostream &, unsigned) */ \ 50 std::string Actual1; \ 51 raw_string_ostream Stream(Actual1); \ 52 encodeULEB128(VALUE, Stream, PAD); \ 53 Stream.flush(); \ 54 EXPECT_EQ(Expected, Actual1); \ 55 \ 56 /* encodeULEB128(uint64_t, uint8_t *, unsigned) */ \ 57 uint8_t Buffer[32]; \ 58 unsigned Size = encodeULEB128(VALUE, Buffer, PAD); \ 59 std::string Actual2(reinterpret_cast<const char *>(Buffer), Size); \ 60 EXPECT_EQ(Expected, Actual2); \ 61 } while (0) 62 63 // Encode ULEB128 64 EXPECT_ULEB128_EQ("\x00", 0, 0); 65 EXPECT_ULEB128_EQ("\x01", 1, 0); 66 EXPECT_ULEB128_EQ("\x3f", 63, 0); 67 EXPECT_ULEB128_EQ("\x40", 64, 0); 68 EXPECT_ULEB128_EQ("\x7f", 0x7f, 0); 69 EXPECT_ULEB128_EQ("\x80\x01", 0x80, 0); 70 EXPECT_ULEB128_EQ("\x81\x01", 0x81, 0); 71 EXPECT_ULEB128_EQ("\x90\x01", 0x90, 0); 72 EXPECT_ULEB128_EQ("\xff\x01", 0xff, 0); 73 EXPECT_ULEB128_EQ("\x80\x02", 0x100, 0); 74 EXPECT_ULEB128_EQ("\x81\x02", 0x101, 0); 75 76 // Encode ULEB128 with some extra padding bytes 77 EXPECT_ULEB128_EQ("\x80\x00", 0, 1); 78 EXPECT_ULEB128_EQ("\x80\x80\x00", 0, 2); 79 EXPECT_ULEB128_EQ("\xff\x00", 0x7f, 1); 80 EXPECT_ULEB128_EQ("\xff\x80\x00", 0x7f, 2); 81 EXPECT_ULEB128_EQ("\x80\x81\x00", 0x80, 1); 82 EXPECT_ULEB128_EQ("\x80\x81\x80\x00", 0x80, 2); 83 84 #undef EXPECT_ULEB128_EQ 85 } 86 87 TEST(LEB128Test, DecodeULEB128) { 88 #define EXPECT_DECODE_ULEB128_EQ(EXPECTED, VALUE) \ 89 do { \ 90 unsigned ActualSize = 0; \ 91 uint64_t Actual = decodeULEB128(reinterpret_cast<const uint8_t *>(VALUE), \ 92 &ActualSize); \ 93 EXPECT_EQ(sizeof(VALUE) - 1, ActualSize); \ 94 EXPECT_EQ(EXPECTED, Actual); \ 95 } while (0) 96 97 // Decode ULEB128 98 EXPECT_DECODE_ULEB128_EQ(0u, "\x00"); 99 EXPECT_DECODE_ULEB128_EQ(1u, "\x01"); 100 EXPECT_DECODE_ULEB128_EQ(63u, "\x3f"); 101 EXPECT_DECODE_ULEB128_EQ(64u, "\x40"); 102 EXPECT_DECODE_ULEB128_EQ(0x7fu, "\x7f"); 103 EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x01"); 104 EXPECT_DECODE_ULEB128_EQ(0x81u, "\x81\x01"); 105 EXPECT_DECODE_ULEB128_EQ(0x90u, "\x90\x01"); 106 EXPECT_DECODE_ULEB128_EQ(0xffu, "\xff\x01"); 107 EXPECT_DECODE_ULEB128_EQ(0x100u, "\x80\x02"); 108 EXPECT_DECODE_ULEB128_EQ(0x101u, "\x81\x02"); 109 110 // Decode ULEB128 with extra padding bytes 111 EXPECT_DECODE_ULEB128_EQ(0u, "\x80\x00"); 112 EXPECT_DECODE_ULEB128_EQ(0u, "\x80\x80\x00"); 113 EXPECT_DECODE_ULEB128_EQ(0x7fu, "\xff\x00"); 114 EXPECT_DECODE_ULEB128_EQ(0x7fu, "\xff\x80\x00"); 115 EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x00"); 116 EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x80\x00"); 117 118 #undef EXPECT_DECODE_ULEB128_EQ 119 } 120 121 TEST(LEB128Test, SLEB128Size) { 122 // Positive Value Testing Plan: 123 // (1) 128 ^ n - 1 ........ need (n+1) bytes 124 // (2) 128 ^ n ............ need (n+1) bytes 125 // (3) 128 ^ n * 63 ....... need (n+1) bytes 126 // (4) 128 ^ n * 64 - 1 ... need (n+1) bytes 127 // (5) 128 ^ n * 64 ....... need (n+2) bytes 128 129 EXPECT_EQ(1u, getSLEB128Size(0x0LL)); 130 EXPECT_EQ(1u, getSLEB128Size(0x1LL)); 131 EXPECT_EQ(1u, getSLEB128Size(0x3fLL)); 132 EXPECT_EQ(1u, getSLEB128Size(0x3fLL)); 133 EXPECT_EQ(2u, getSLEB128Size(0x40LL)); 134 135 EXPECT_EQ(2u, getSLEB128Size(0x7fLL)); 136 EXPECT_EQ(2u, getSLEB128Size(0x80LL)); 137 EXPECT_EQ(2u, getSLEB128Size(0x1f80LL)); 138 EXPECT_EQ(2u, getSLEB128Size(0x1fffLL)); 139 EXPECT_EQ(3u, getSLEB128Size(0x2000LL)); 140 141 EXPECT_EQ(3u, getSLEB128Size(0x3fffLL)); 142 EXPECT_EQ(3u, getSLEB128Size(0x4000LL)); 143 EXPECT_EQ(3u, getSLEB128Size(0xfc000LL)); 144 EXPECT_EQ(3u, getSLEB128Size(0xfffffLL)); 145 EXPECT_EQ(4u, getSLEB128Size(0x100000LL)); 146 147 EXPECT_EQ(4u, getSLEB128Size(0x1fffffLL)); 148 EXPECT_EQ(4u, getSLEB128Size(0x200000LL)); 149 EXPECT_EQ(4u, getSLEB128Size(0x7e00000LL)); 150 EXPECT_EQ(4u, getSLEB128Size(0x7ffffffLL)); 151 EXPECT_EQ(5u, getSLEB128Size(0x8000000LL)); 152 153 EXPECT_EQ(5u, getSLEB128Size(0xfffffffLL)); 154 EXPECT_EQ(5u, getSLEB128Size(0x10000000LL)); 155 EXPECT_EQ(5u, getSLEB128Size(0x3f0000000LL)); 156 EXPECT_EQ(5u, getSLEB128Size(0x3ffffffffLL)); 157 EXPECT_EQ(6u, getSLEB128Size(0x400000000LL)); 158 159 EXPECT_EQ(6u, getSLEB128Size(0x7ffffffffLL)); 160 EXPECT_EQ(6u, getSLEB128Size(0x800000000LL)); 161 EXPECT_EQ(6u, getSLEB128Size(0x1f800000000LL)); 162 EXPECT_EQ(6u, getSLEB128Size(0x1ffffffffffLL)); 163 EXPECT_EQ(7u, getSLEB128Size(0x20000000000LL)); 164 165 EXPECT_EQ(7u, getSLEB128Size(0x3ffffffffffLL)); 166 EXPECT_EQ(7u, getSLEB128Size(0x40000000000LL)); 167 EXPECT_EQ(7u, getSLEB128Size(0xfc0000000000LL)); 168 EXPECT_EQ(7u, getSLEB128Size(0xffffffffffffLL)); 169 EXPECT_EQ(8u, getSLEB128Size(0x1000000000000LL)); 170 171 EXPECT_EQ(8u, getSLEB128Size(0x1ffffffffffffLL)); 172 EXPECT_EQ(8u, getSLEB128Size(0x2000000000000LL)); 173 EXPECT_EQ(8u, getSLEB128Size(0x7e000000000000LL)); 174 EXPECT_EQ(8u, getSLEB128Size(0x7fffffffffffffLL)); 175 EXPECT_EQ(9u, getSLEB128Size(0x80000000000000LL)); 176 177 EXPECT_EQ(9u, getSLEB128Size(0xffffffffffffffLL)); 178 EXPECT_EQ(9u, getSLEB128Size(0x100000000000000LL)); 179 EXPECT_EQ(9u, getSLEB128Size(0x3f00000000000000LL)); 180 EXPECT_EQ(9u, getSLEB128Size(0x3fffffffffffffffLL)); 181 EXPECT_EQ(10u, getSLEB128Size(0x4000000000000000LL)); 182 183 EXPECT_EQ(10u, getSLEB128Size(0x7fffffffffffffffLL)); 184 EXPECT_EQ(10u, getSLEB128Size(INT64_MAX)); 185 186 // Negative Value Testing Plan: 187 // (1) - 128 ^ n - 1 ........ need (n+1) bytes 188 // (2) - 128 ^ n ............ need (n+1) bytes 189 // (3) - 128 ^ n * 63 ....... need (n+1) bytes 190 // (4) - 128 ^ n * 64 ....... need (n+1) bytes (different from positive one) 191 // (5) - 128 ^ n * 65 - 1 ... need (n+2) bytes (if n > 0) 192 // (6) - 128 ^ n * 65 ....... need (n+2) bytes 193 194 EXPECT_EQ(1u, getSLEB128Size(0x0LL)); 195 EXPECT_EQ(1u, getSLEB128Size(-0x1LL)); 196 EXPECT_EQ(1u, getSLEB128Size(-0x3fLL)); 197 EXPECT_EQ(1u, getSLEB128Size(-0x40LL)); 198 EXPECT_EQ(1u, getSLEB128Size(-0x40LL)); // special case 199 EXPECT_EQ(2u, getSLEB128Size(-0x41LL)); 200 201 EXPECT_EQ(2u, getSLEB128Size(-0x7fLL)); 202 EXPECT_EQ(2u, getSLEB128Size(-0x80LL)); 203 EXPECT_EQ(2u, getSLEB128Size(-0x1f80LL)); 204 EXPECT_EQ(2u, getSLEB128Size(-0x2000LL)); 205 EXPECT_EQ(3u, getSLEB128Size(-0x207fLL)); 206 EXPECT_EQ(3u, getSLEB128Size(-0x2080LL)); 207 208 EXPECT_EQ(3u, getSLEB128Size(-0x3fffLL)); 209 EXPECT_EQ(3u, getSLEB128Size(-0x4000LL)); 210 EXPECT_EQ(3u, getSLEB128Size(-0xfc000LL)); 211 EXPECT_EQ(3u, getSLEB128Size(-0x100000LL)); 212 EXPECT_EQ(4u, getSLEB128Size(-0x103fffLL)); 213 EXPECT_EQ(4u, getSLEB128Size(-0x104000LL)); 214 215 EXPECT_EQ(4u, getSLEB128Size(-0x1fffffLL)); 216 EXPECT_EQ(4u, getSLEB128Size(-0x200000LL)); 217 EXPECT_EQ(4u, getSLEB128Size(-0x7e00000LL)); 218 EXPECT_EQ(4u, getSLEB128Size(-0x8000000LL)); 219 EXPECT_EQ(5u, getSLEB128Size(-0x81fffffLL)); 220 EXPECT_EQ(5u, getSLEB128Size(-0x8200000LL)); 221 222 EXPECT_EQ(5u, getSLEB128Size(-0xfffffffLL)); 223 EXPECT_EQ(5u, getSLEB128Size(-0x10000000LL)); 224 EXPECT_EQ(5u, getSLEB128Size(-0x3f0000000LL)); 225 EXPECT_EQ(5u, getSLEB128Size(-0x400000000LL)); 226 EXPECT_EQ(6u, getSLEB128Size(-0x40fffffffLL)); 227 EXPECT_EQ(6u, getSLEB128Size(-0x410000000LL)); 228 229 EXPECT_EQ(6u, getSLEB128Size(-0x7ffffffffLL)); 230 EXPECT_EQ(6u, getSLEB128Size(-0x800000000LL)); 231 EXPECT_EQ(6u, getSLEB128Size(-0x1f800000000LL)); 232 EXPECT_EQ(6u, getSLEB128Size(-0x20000000000LL)); 233 EXPECT_EQ(7u, getSLEB128Size(-0x207ffffffffLL)); 234 EXPECT_EQ(7u, getSLEB128Size(-0x20800000000LL)); 235 236 EXPECT_EQ(7u, getSLEB128Size(-0x3ffffffffffLL)); 237 EXPECT_EQ(7u, getSLEB128Size(-0x40000000000LL)); 238 EXPECT_EQ(7u, getSLEB128Size(-0xfc0000000000LL)); 239 EXPECT_EQ(7u, getSLEB128Size(-0x1000000000000LL)); 240 EXPECT_EQ(8u, getSLEB128Size(-0x103ffffffffffLL)); 241 EXPECT_EQ(8u, getSLEB128Size(-0x1040000000000LL)); 242 243 EXPECT_EQ(8u, getSLEB128Size(-0x1ffffffffffffLL)); 244 EXPECT_EQ(8u, getSLEB128Size(-0x2000000000000LL)); 245 EXPECT_EQ(8u, getSLEB128Size(-0x7e000000000000LL)); 246 EXPECT_EQ(8u, getSLEB128Size(-0x80000000000000LL)); 247 EXPECT_EQ(9u, getSLEB128Size(-0x81ffffffffffffLL)); 248 EXPECT_EQ(9u, getSLEB128Size(-0x82000000000000LL)); 249 250 EXPECT_EQ(9u, getSLEB128Size(-0xffffffffffffffLL)); 251 EXPECT_EQ(9u, getSLEB128Size(-0x100000000000000LL)); 252 EXPECT_EQ(9u, getSLEB128Size(-0x3f00000000000000LL)); 253 EXPECT_EQ(9u, getSLEB128Size(-0x4000000000000000LL)); 254 EXPECT_EQ(10u, getSLEB128Size(-0x40ffffffffffffffLL)); 255 EXPECT_EQ(10u, getSLEB128Size(-0x4100000000000000LL)); 256 257 EXPECT_EQ(10u, getSLEB128Size(-0x7fffffffffffffffLL)); 258 EXPECT_EQ(10u, getSLEB128Size(-0x8000000000000000LL)); 259 EXPECT_EQ(10u, getSLEB128Size(INT64_MIN)); 260 } 261 262 TEST(LEB128Test, ULEB128Size) { 263 // Testing Plan: 264 // (1) 128 ^ n ............ need (n+1) bytes 265 // (2) 128 ^ n * 64 ....... need (n+1) bytes 266 // (3) 128 ^ (n+1) - 1 .... need (n+1) bytes 267 268 EXPECT_EQ(1u, getULEB128Size(0)); // special case 269 270 EXPECT_EQ(1u, getULEB128Size(0x1ULL)); 271 EXPECT_EQ(1u, getULEB128Size(0x40ULL)); 272 EXPECT_EQ(1u, getULEB128Size(0x7fULL)); 273 274 EXPECT_EQ(2u, getULEB128Size(0x80ULL)); 275 EXPECT_EQ(2u, getULEB128Size(0x2000ULL)); 276 EXPECT_EQ(2u, getULEB128Size(0x3fffULL)); 277 278 EXPECT_EQ(3u, getULEB128Size(0x4000ULL)); 279 EXPECT_EQ(3u, getULEB128Size(0x100000ULL)); 280 EXPECT_EQ(3u, getULEB128Size(0x1fffffULL)); 281 282 EXPECT_EQ(4u, getULEB128Size(0x200000ULL)); 283 EXPECT_EQ(4u, getULEB128Size(0x8000000ULL)); 284 EXPECT_EQ(4u, getULEB128Size(0xfffffffULL)); 285 286 EXPECT_EQ(5u, getULEB128Size(0x10000000ULL)); 287 EXPECT_EQ(5u, getULEB128Size(0x400000000ULL)); 288 EXPECT_EQ(5u, getULEB128Size(0x7ffffffffULL)); 289 290 EXPECT_EQ(6u, getULEB128Size(0x800000000ULL)); 291 EXPECT_EQ(6u, getULEB128Size(0x20000000000ULL)); 292 EXPECT_EQ(6u, getULEB128Size(0x3ffffffffffULL)); 293 294 EXPECT_EQ(7u, getULEB128Size(0x40000000000ULL)); 295 EXPECT_EQ(7u, getULEB128Size(0x1000000000000ULL)); 296 EXPECT_EQ(7u, getULEB128Size(0x1ffffffffffffULL)); 297 298 EXPECT_EQ(8u, getULEB128Size(0x2000000000000ULL)); 299 EXPECT_EQ(8u, getULEB128Size(0x80000000000000ULL)); 300 EXPECT_EQ(8u, getULEB128Size(0xffffffffffffffULL)); 301 302 EXPECT_EQ(9u, getULEB128Size(0x100000000000000ULL)); 303 EXPECT_EQ(9u, getULEB128Size(0x4000000000000000ULL)); 304 EXPECT_EQ(9u, getULEB128Size(0x7fffffffffffffffULL)); 305 306 EXPECT_EQ(10u, getULEB128Size(0x8000000000000000ULL)); 307 308 EXPECT_EQ(10u, getULEB128Size(UINT64_MAX)); 309 } 310 311 } // anonymous namespace 312
