llvm/unittests/Support/LEB128Test.cpp

   1 //===- llvm/unittest/Support/LEB128Test.cpp - LEB128 function tests -------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Support/LEB128.h"
  10 #include "llvm/Support/DataTypes.h"
  11 #include "llvm/Support/raw_ostream.h"
  12 #include "gtest/gtest.h"
  13 #include <string>
  14 using namespace llvm;
  15
  16 namespace {
  17
  18 TEST(LEB128Test, EncodeSLEB128) {
  19 #define EXPECT_SLEB128_EQ(EXPECTED, VALUE, PAD) \
  20   do { \
  21     std::string Expected(EXPECTED, sizeof(EXPECTED) - 1); \
  22     \
  23     /* encodeSLEB128(uint64_t, raw_ostream &, unsigned) */ \
  24     std::string Actual1; \
  25     raw_string_ostream Stream(Actual1); \
  26     encodeSLEB128(VALUE, Stream, PAD); \
  27     Stream.flush(); \
  28     EXPECT_EQ(Expected, Actual1); \
  29     \
  30     /* encodeSLEB128(uint64_t, uint8_t *, unsigned) */ \
  31     uint8_t Buffer[32]; \
  32     unsigned Size = encodeSLEB128(VALUE, Buffer, PAD); \
  33     std::string Actual2(reinterpret_cast<const char *>(Buffer), Size); \
  34     EXPECT_EQ(Expected, Actual2); \
  35   } while (0)
  36
  37   // Encode SLEB128
  38   EXPECT_SLEB128_EQ("\x00", 0, 0);
  39   EXPECT_SLEB128_EQ("\x01", 1, 0);
  40   EXPECT_SLEB128_EQ("\x7f", -1, 0);
  41   EXPECT_SLEB128_EQ("\x3f", 63, 0);
  42   EXPECT_SLEB128_EQ("\x41", -63, 0);
  43   EXPECT_SLEB128_EQ("\x40", -64, 0);
  44   EXPECT_SLEB128_EQ("\xbf\x7f", -65, 0);
  45   EXPECT_SLEB128_EQ("\xc0\x00", 64, 0);
  46
  47   // Encode SLEB128 with some extra padding bytes
  48   EXPECT_SLEB128_EQ("\x80\x00", 0, 2);
  49   EXPECT_SLEB128_EQ("\x80\x80\x00", 0, 3);
  50   EXPECT_SLEB128_EQ("\xff\x80\x00", 0x7f, 3);
  51   EXPECT_SLEB128_EQ("\xff\x80\x80\x00", 0x7f, 4);
  52   EXPECT_SLEB128_EQ("\x80\x81\x00", 0x80, 3);
  53   EXPECT_SLEB128_EQ("\x80\x81\x80\x00", 0x80, 4);
  54   EXPECT_SLEB128_EQ("\xc0\x7f", -0x40, 2);
  55
  56   EXPECT_SLEB128_EQ("\xc0\xff\x7f", -0x40, 3);
  57   EXPECT_SLEB128_EQ("\x80\xff\x7f", -0x80, 3);
  58   EXPECT_SLEB128_EQ("\x80\xff\xff\x7f", -0x80, 4);
  59
  60 #undef EXPECT_SLEB128_EQ
  61 }
  62
  63 TEST(LEB128Test, EncodeULEB128) {
  64 #define EXPECT_ULEB128_EQ(EXPECTED, VALUE, PAD) \
  65   do { \
  66     std::string Expected(EXPECTED, sizeof(EXPECTED) - 1); \
  67     \
  68     /* encodeULEB128(uint64_t, raw_ostream &, unsigned) */ \
  69     std::string Actual1; \
  70     raw_string_ostream Stream(Actual1); \
  71     encodeULEB128(VALUE, Stream, PAD); \
  72     Stream.flush(); \
  73     EXPECT_EQ(Expected, Actual1); \
  74     \
  75     /* encodeULEB128(uint64_t, uint8_t *, unsigned) */ \
  76     uint8_t Buffer[32]; \
  77     unsigned Size = encodeULEB128(VALUE, Buffer, PAD); \
  78     std::string Actual2(reinterpret_cast<const char *>(Buffer), Size); \
  79     EXPECT_EQ(Expected, Actual2); \
  80   } while (0)
  81
  82   // Encode ULEB128
  83   EXPECT_ULEB128_EQ("\x00", 0, 0);
  84   EXPECT_ULEB128_EQ("\x01", 1, 0);
  85   EXPECT_ULEB128_EQ("\x3f", 63, 0);
  86   EXPECT_ULEB128_EQ("\x40", 64, 0);
  87   EXPECT_ULEB128_EQ("\x7f", 0x7f, 0);
  88   EXPECT_ULEB128_EQ("\x80\x01", 0x80, 0);
  89   EXPECT_ULEB128_EQ("\x81\x01", 0x81, 0);
  90   EXPECT_ULEB128_EQ("\x90\x01", 0x90, 0);
  91   EXPECT_ULEB128_EQ("\xff\x01", 0xff, 0);
  92   EXPECT_ULEB128_EQ("\x80\x02", 0x100, 0);
  93   EXPECT_ULEB128_EQ("\x81\x02", 0x101, 0);
  94
  95   // Encode ULEB128 with some extra padding bytes
  96   EXPECT_ULEB128_EQ("\x80\x00", 0, 2);
  97   EXPECT_ULEB128_EQ("\x80\x80\x00", 0, 3);
  98   EXPECT_ULEB128_EQ("\xff\x00", 0x7f, 2);
  99   EXPECT_ULEB128_EQ("\xff\x80\x00", 0x7f, 3);
 100   EXPECT_ULEB128_EQ("\x80\x81\x00", 0x80, 3);
 101   EXPECT_ULEB128_EQ("\x80\x81\x80\x00", 0x80, 4);
 102
 103 #undef EXPECT_ULEB128_EQ
 104 }
 105
 106 TEST(LEB128Test, DecodeULEB128) {
 107 #define EXPECT_DECODE_ULEB128_EQ(EXPECTED, VALUE) \
 108   do { \
 109     unsigned ActualSize = 0; \
 110     uint64_t Actual = decodeULEB128(reinterpret_cast<const uint8_t *>(VALUE), \
 111                                     &ActualSize); \
 112     EXPECT_EQ(sizeof(VALUE) - 1, ActualSize); \
 113     EXPECT_EQ(EXPECTED, Actual); \
 114   } while (0)
 115
 116   // Don't crash
 117   EXPECT_EQ(0u, decodeULEB128(nullptr, nullptr, nullptr));
 118
 119   // Decode ULEB128
 120   EXPECT_DECODE_ULEB128_EQ(0u, "\x00");
 121   EXPECT_DECODE_ULEB128_EQ(1u, "\x01");
 122   EXPECT_DECODE_ULEB128_EQ(63u, "\x3f");
 123   EXPECT_DECODE_ULEB128_EQ(64u, "\x40");
 124   EXPECT_DECODE_ULEB128_EQ(0x7fu, "\x7f");
 125   EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x01");
 126   EXPECT_DECODE_ULEB128_EQ(0x81u, "\x81\x01");
 127   EXPECT_DECODE_ULEB128_EQ(0x90u, "\x90\x01");
 128   EXPECT_DECODE_ULEB128_EQ(0xffu, "\xff\x01");
 129   EXPECT_DECODE_ULEB128_EQ(0x100u, "\x80\x02");
 130   EXPECT_DECODE_ULEB128_EQ(0x101u, "\x81\x02");
 131   EXPECT_DECODE_ULEB128_EQ(4294975616ULL, "\x80\xc1\x80\x80\x10");
 132
 133   // Decode ULEB128 with extra padding bytes
 134   EXPECT_DECODE_ULEB128_EQ(0u, "\x80\x00");
 135   EXPECT_DECODE_ULEB128_EQ(0u, "\x80\x80\x00");
 136   EXPECT_DECODE_ULEB128_EQ(0x7fu, "\xff\x00");
 137   EXPECT_DECODE_ULEB128_EQ(0x7fu, "\xff\x80\x00");
 138   EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x00");
 139   EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x80\x00");
 140   EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x80\x80\x80\x80\x80\x80\x80\x00");
 141   EXPECT_DECODE_ULEB128_EQ(0x80000000'00000000ul,
 142                            "\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01");
 143
 144 #undef EXPECT_DECODE_ULEB128_EQ
 145 }
 146
 147 TEST(LEB128Test, DecodeInvalidULEB128) {
 148 #define EXPECT_INVALID_ULEB128(VALUE, ERROR_OFFSET)                            \
 149   do {                                                                         \
 150     const uint8_t *Value = reinterpret_cast<const uint8_t *>(VALUE);           \
 151     const char *Error = nullptr;                                               \
 152     unsigned ErrorOffset = 0;                                                  \
 153     uint64_t Actual =                                                          \
 154         decodeULEB128(Value, &ErrorOffset, Value + strlen(VALUE), &Error);     \
 155     EXPECT_NE(Error, nullptr);                                                 \
 156     EXPECT_EQ(0ul, Actual);                                                    \
 157     EXPECT_EQ(ERROR_OFFSET, ErrorOffset);                                      \
 158   } while (0)
 159
 160   // Buffer overflow.
 161   EXPECT_INVALID_ULEB128("", 0u);
 162   EXPECT_INVALID_ULEB128("\x80", 1u);
 163
 164   // Does not fit in 64 bits.
 165   EXPECT_INVALID_ULEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x02", 9u);
 166   EXPECT_INVALID_ULEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x02", 10u);
 167
 168 #undef EXPECT_INVALID_ULEB128
 169 }
 170
 171 TEST(LEB128Test, DecodeSLEB128) {
 172 #define EXPECT_DECODE_SLEB128_EQ(EXPECTED, VALUE) \
 173   do { \
 174     unsigned ActualSize = 0; \
 175     int64_t Actual = decodeSLEB128(reinterpret_cast<const uint8_t *>(VALUE), \
 176                                     &ActualSize); \
 177     EXPECT_EQ(sizeof(VALUE) - 1, ActualSize); \
 178     EXPECT_EQ(EXPECTED, Actual); \
 179   } while (0)
 180
 181   // Don't crash
 182   EXPECT_EQ(0, decodeSLEB128(nullptr, nullptr, nullptr));
 183
 184   // Decode SLEB128
 185   EXPECT_DECODE_SLEB128_EQ(0L, "\x00");
 186   EXPECT_DECODE_SLEB128_EQ(1L, "\x01");
 187   EXPECT_DECODE_SLEB128_EQ(63L, "\x3f");
 188   EXPECT_DECODE_SLEB128_EQ(-64L, "\x40");
 189   EXPECT_DECODE_SLEB128_EQ(-63L, "\x41");
 190   EXPECT_DECODE_SLEB128_EQ(-1L, "\x7f");
 191   EXPECT_DECODE_SLEB128_EQ(128L, "\x80\x01");
 192   EXPECT_DECODE_SLEB128_EQ(129L, "\x81\x01");
 193   EXPECT_DECODE_SLEB128_EQ(-129L, "\xff\x7e");
 194   EXPECT_DECODE_SLEB128_EQ(-128L, "\x80\x7f");
 195   EXPECT_DECODE_SLEB128_EQ(-127L, "\x81\x7f");
 196   EXPECT_DECODE_SLEB128_EQ(64L, "\xc0\x00");
 197   EXPECT_DECODE_SLEB128_EQ(-12345L, "\xc7\x9f\x7f");
 198
 199   // Decode unnormalized SLEB128 with extra padding bytes.
 200   EXPECT_DECODE_SLEB128_EQ(0L, "\x80\x00");
 201   EXPECT_DECODE_SLEB128_EQ(0L, "\x80\x80\x00");
 202   EXPECT_DECODE_SLEB128_EQ(0x7fL, "\xff\x00");
 203   EXPECT_DECODE_SLEB128_EQ(0x7fL, "\xff\x80\x00");
 204   EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x00");
 205   EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x80\x00");
 206   EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x80\x80\x80\x80\x80\x80\x80\x00");
 207   EXPECT_DECODE_SLEB128_EQ(-2L, "\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F");
 208   EXPECT_DECODE_SLEB128_EQ(INT64_MIN,
 209                            "\x80\x80\x80\x80\x80\x80\x80\x80\x80\x7F");
 210   EXPECT_DECODE_SLEB128_EQ(INT64_MAX,
 211                            "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00");
 212
 213 #undef EXPECT_DECODE_SLEB128_EQ
 214 }
 215
 216 TEST(LEB128Test, DecodeInvalidSLEB128) {
 217 #define EXPECT_INVALID_SLEB128(VALUE, ERROR_OFFSET)                            \
 218   do {                                                                         \
 219     const uint8_t *Value = reinterpret_cast<const uint8_t *>(VALUE);           \
 220     const char *Error = nullptr;                                               \
 221     unsigned ErrorOffset = 0;                                                  \
 222     uint64_t Actual =                                                          \
 223         decodeSLEB128(Value, &ErrorOffset, Value + strlen(VALUE), &Error);     \
 224     EXPECT_NE(Error, nullptr);                                                 \
 225     EXPECT_EQ(0ul, Actual);                                                    \
 226     EXPECT_EQ(ERROR_OFFSET, ErrorOffset);                                      \
 227   } while (0)
 228
 229   // Buffer overflow.
 230   EXPECT_INVALID_SLEB128("", 0u);
 231   EXPECT_INVALID_SLEB128("\x80", 1u);
 232
 233   // Does not fit in 64 bits.
 234   EXPECT_INVALID_SLEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01", 9u);
 235   EXPECT_INVALID_SLEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x7E", 9u);
 236   EXPECT_INVALID_SLEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x02", 10u);
 237   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7E", 9u);
 238   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x01", 9u);
 239   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7E", 10u);
 240   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", 10u);
 241
 242 #undef EXPECT_INVALID_SLEB128
 243 }
 244
 245 TEST(LEB128Test, SLEB128Size) {
 246   // Positive Value Testing Plan:
 247   // (1) 128 ^ n - 1 ........ need (n+1) bytes
 248   // (2) 128 ^ n ............ need (n+1) bytes
 249   // (3) 128 ^ n * 63 ....... need (n+1) bytes
 250   // (4) 128 ^ n * 64 - 1 ... need (n+1) bytes
 251   // (5) 128 ^ n * 64 ....... need (n+2) bytes
 252
 253   EXPECT_EQ(1u, getSLEB128Size(0x0LL));
 254   EXPECT_EQ(1u, getSLEB128Size(0x1LL));
 255   EXPECT_EQ(1u, getSLEB128Size(0x3fLL));
 256   EXPECT_EQ(1u, getSLEB128Size(0x3fLL));
 257   EXPECT_EQ(2u, getSLEB128Size(0x40LL));
 258
 259   EXPECT_EQ(2u, getSLEB128Size(0x7fLL));
 260   EXPECT_EQ(2u, getSLEB128Size(0x80LL));
 261   EXPECT_EQ(2u, getSLEB128Size(0x1f80LL));
 262   EXPECT_EQ(2u, getSLEB128Size(0x1fffLL));
 263   EXPECT_EQ(3u, getSLEB128Size(0x2000LL));
 264
 265   EXPECT_EQ(3u, getSLEB128Size(0x3fffLL));
 266   EXPECT_EQ(3u, getSLEB128Size(0x4000LL));
 267   EXPECT_EQ(3u, getSLEB128Size(0xfc000LL));
 268   EXPECT_EQ(3u, getSLEB128Size(0xfffffLL));
 269   EXPECT_EQ(4u, getSLEB128Size(0x100000LL));
 270
 271   EXPECT_EQ(4u, getSLEB128Size(0x1fffffLL));
 272   EXPECT_EQ(4u, getSLEB128Size(0x200000LL));
 273   EXPECT_EQ(4u, getSLEB128Size(0x7e00000LL));
 274   EXPECT_EQ(4u, getSLEB128Size(0x7ffffffLL));
 275   EXPECT_EQ(5u, getSLEB128Size(0x8000000LL));
 276
 277   EXPECT_EQ(5u, getSLEB128Size(0xfffffffLL));
 278   EXPECT_EQ(5u, getSLEB128Size(0x10000000LL));
 279   EXPECT_EQ(5u, getSLEB128Size(0x3f0000000LL));
 280   EXPECT_EQ(5u, getSLEB128Size(0x3ffffffffLL));
 281   EXPECT_EQ(6u, getSLEB128Size(0x400000000LL));
 282
 283   EXPECT_EQ(6u, getSLEB128Size(0x7ffffffffLL));
 284   EXPECT_EQ(6u, getSLEB128Size(0x800000000LL));
 285   EXPECT_EQ(6u, getSLEB128Size(0x1f800000000LL));
 286   EXPECT_EQ(6u, getSLEB128Size(0x1ffffffffffLL));
 287   EXPECT_EQ(7u, getSLEB128Size(0x20000000000LL));
 288
 289   EXPECT_EQ(7u, getSLEB128Size(0x3ffffffffffLL));
 290   EXPECT_EQ(7u, getSLEB128Size(0x40000000000LL));
 291   EXPECT_EQ(7u, getSLEB128Size(0xfc0000000000LL));
 292   EXPECT_EQ(7u, getSLEB128Size(0xffffffffffffLL));
 293   EXPECT_EQ(8u, getSLEB128Size(0x1000000000000LL));
 294
 295   EXPECT_EQ(8u, getSLEB128Size(0x1ffffffffffffLL));
 296   EXPECT_EQ(8u, getSLEB128Size(0x2000000000000LL));
 297   EXPECT_EQ(8u, getSLEB128Size(0x7e000000000000LL));
 298   EXPECT_EQ(8u, getSLEB128Size(0x7fffffffffffffLL));
 299   EXPECT_EQ(9u, getSLEB128Size(0x80000000000000LL));
 300
 301   EXPECT_EQ(9u, getSLEB128Size(0xffffffffffffffLL));
 302   EXPECT_EQ(9u, getSLEB128Size(0x100000000000000LL));
 303   EXPECT_EQ(9u, getSLEB128Size(0x3f00000000000000LL));
 304   EXPECT_EQ(9u, getSLEB128Size(0x3fffffffffffffffLL));
 305   EXPECT_EQ(10u, getSLEB128Size(0x4000000000000000LL));
 306
 307   EXPECT_EQ(10u, getSLEB128Size(0x7fffffffffffffffLL));
 308   EXPECT_EQ(10u, getSLEB128Size(INT64_MAX));
 309
 310   // Negative Value Testing Plan:
 311   // (1) - 128 ^ n - 1 ........ need (n+1) bytes
 312   // (2) - 128 ^ n ............ need (n+1) bytes
 313   // (3) - 128 ^ n * 63 ....... need (n+1) bytes
 314   // (4) - 128 ^ n * 64 ....... need (n+1) bytes (different from positive one)
 315   // (5) - 128 ^ n * 65 - 1 ... need (n+2) bytes (if n > 0)
 316   // (6) - 128 ^ n * 65 ....... need (n+2) bytes
 317
 318   EXPECT_EQ(1u, getSLEB128Size(0x0LL));
 319   EXPECT_EQ(1u, getSLEB128Size(-0x1LL));
 320   EXPECT_EQ(1u, getSLEB128Size(-0x3fLL));
 321   EXPECT_EQ(1u, getSLEB128Size(-0x40LL));
 322   EXPECT_EQ(1u, getSLEB128Size(-0x40LL)); // special case
 323   EXPECT_EQ(2u, getSLEB128Size(-0x41LL));
 324
 325   EXPECT_EQ(2u, getSLEB128Size(-0x7fLL));
 326   EXPECT_EQ(2u, getSLEB128Size(-0x80LL));
 327   EXPECT_EQ(2u, getSLEB128Size(-0x1f80LL));
 328   EXPECT_EQ(2u, getSLEB128Size(-0x2000LL));
 329   EXPECT_EQ(3u, getSLEB128Size(-0x207fLL));
 330   EXPECT_EQ(3u, getSLEB128Size(-0x2080LL));
 331
 332   EXPECT_EQ(3u, getSLEB128Size(-0x3fffLL));
 333   EXPECT_EQ(3u, getSLEB128Size(-0x4000LL));
 334   EXPECT_EQ(3u, getSLEB128Size(-0xfc000LL));
 335   EXPECT_EQ(3u, getSLEB128Size(-0x100000LL));
 336   EXPECT_EQ(4u, getSLEB128Size(-0x103fffLL));
 337   EXPECT_EQ(4u, getSLEB128Size(-0x104000LL));
 338
 339   EXPECT_EQ(4u, getSLEB128Size(-0x1fffffLL));
 340   EXPECT_EQ(4u, getSLEB128Size(-0x200000LL));
 341   EXPECT_EQ(4u, getSLEB128Size(-0x7e00000LL));
 342   EXPECT_EQ(4u, getSLEB128Size(-0x8000000LL));
 343   EXPECT_EQ(5u, getSLEB128Size(-0x81fffffLL));
 344   EXPECT_EQ(5u, getSLEB128Size(-0x8200000LL));
 345
 346   EXPECT_EQ(5u, getSLEB128Size(-0xfffffffLL));
 347   EXPECT_EQ(5u, getSLEB128Size(-0x10000000LL));
 348   EXPECT_EQ(5u, getSLEB128Size(-0x3f0000000LL));
 349   EXPECT_EQ(5u, getSLEB128Size(-0x400000000LL));
 350   EXPECT_EQ(6u, getSLEB128Size(-0x40fffffffLL));
 351   EXPECT_EQ(6u, getSLEB128Size(-0x410000000LL));
 352
 353   EXPECT_EQ(6u, getSLEB128Size(-0x7ffffffffLL));
 354   EXPECT_EQ(6u, getSLEB128Size(-0x800000000LL));
 355   EXPECT_EQ(6u, getSLEB128Size(-0x1f800000000LL));
 356   EXPECT_EQ(6u, getSLEB128Size(-0x20000000000LL));
 357   EXPECT_EQ(7u, getSLEB128Size(-0x207ffffffffLL));
 358   EXPECT_EQ(7u, getSLEB128Size(-0x20800000000LL));
 359
 360   EXPECT_EQ(7u, getSLEB128Size(-0x3ffffffffffLL));
 361   EXPECT_EQ(7u, getSLEB128Size(-0x40000000000LL));
 362   EXPECT_EQ(7u, getSLEB128Size(-0xfc0000000000LL));
 363   EXPECT_EQ(7u, getSLEB128Size(-0x1000000000000LL));
 364   EXPECT_EQ(8u, getSLEB128Size(-0x103ffffffffffLL));
 365   EXPECT_EQ(8u, getSLEB128Size(-0x1040000000000LL));
 366
 367   EXPECT_EQ(8u, getSLEB128Size(-0x1ffffffffffffLL));
 368   EXPECT_EQ(8u, getSLEB128Size(-0x2000000000000LL));
 369   EXPECT_EQ(8u, getSLEB128Size(-0x7e000000000000LL));
 370   EXPECT_EQ(8u, getSLEB128Size(-0x80000000000000LL));
 371   EXPECT_EQ(9u, getSLEB128Size(-0x81ffffffffffffLL));
 372   EXPECT_EQ(9u, getSLEB128Size(-0x82000000000000LL));
 373
 374   EXPECT_EQ(9u, getSLEB128Size(-0xffffffffffffffLL));
 375   EXPECT_EQ(9u, getSLEB128Size(-0x100000000000000LL));
 376   EXPECT_EQ(9u, getSLEB128Size(-0x3f00000000000000LL));
 377   EXPECT_EQ(9u, getSLEB128Size(-0x4000000000000000LL));
 378   EXPECT_EQ(10u, getSLEB128Size(-0x40ffffffffffffffLL));
 379   EXPECT_EQ(10u, getSLEB128Size(-0x4100000000000000LL));
 380
 381   EXPECT_EQ(10u, getSLEB128Size(-0x7fffffffffffffffLL));
 382   EXPECT_EQ(10u, getSLEB128Size(-0x8000000000000000LL));
 383   EXPECT_EQ(10u, getSLEB128Size(INT64_MIN));
 384 }
 385
 386 TEST(LEB128Test, ULEB128Size) {
 387   // Testing Plan:
 388   // (1) 128 ^ n ............ need (n+1) bytes
 389   // (2) 128 ^ n * 64 ....... need (n+1) bytes
 390   // (3) 128 ^ (n+1) - 1 .... need (n+1) bytes
 391
 392   EXPECT_EQ(1u, getULEB128Size(0)); // special case
 393
 394   EXPECT_EQ(1u, getULEB128Size(0x1ULL));
 395   EXPECT_EQ(1u, getULEB128Size(0x40ULL));
 396   EXPECT_EQ(1u, getULEB128Size(0x7fULL));
 397
 398   EXPECT_EQ(2u, getULEB128Size(0x80ULL));
 399   EXPECT_EQ(2u, getULEB128Size(0x2000ULL));
 400   EXPECT_EQ(2u, getULEB128Size(0x3fffULL));
 401
 402   EXPECT_EQ(3u, getULEB128Size(0x4000ULL));
 403   EXPECT_EQ(3u, getULEB128Size(0x100000ULL));
 404   EXPECT_EQ(3u, getULEB128Size(0x1fffffULL));
 405
 406   EXPECT_EQ(4u, getULEB128Size(0x200000ULL));
 407   EXPECT_EQ(4u, getULEB128Size(0x8000000ULL));
 408   EXPECT_EQ(4u, getULEB128Size(0xfffffffULL));
 409
 410   EXPECT_EQ(5u, getULEB128Size(0x10000000ULL));
 411   EXPECT_EQ(5u, getULEB128Size(0x400000000ULL));
 412   EXPECT_EQ(5u, getULEB128Size(0x7ffffffffULL));
 413
 414   EXPECT_EQ(6u, getULEB128Size(0x800000000ULL));
 415   EXPECT_EQ(6u, getULEB128Size(0x20000000000ULL));
 416   EXPECT_EQ(6u, getULEB128Size(0x3ffffffffffULL));
 417
 418   EXPECT_EQ(7u, getULEB128Size(0x40000000000ULL));
 419   EXPECT_EQ(7u, getULEB128Size(0x1000000000000ULL));
 420   EXPECT_EQ(7u, getULEB128Size(0x1ffffffffffffULL));
 421
 422   EXPECT_EQ(8u, getULEB128Size(0x2000000000000ULL));
 423   EXPECT_EQ(8u, getULEB128Size(0x80000000000000ULL));
 424   EXPECT_EQ(8u, getULEB128Size(0xffffffffffffffULL));
 425
 426   EXPECT_EQ(9u, getULEB128Size(0x100000000000000ULL));
 427   EXPECT_EQ(9u, getULEB128Size(0x4000000000000000ULL));
 428   EXPECT_EQ(9u, getULEB128Size(0x7fffffffffffffffULL));
 429
 430   EXPECT_EQ(10u, getULEB128Size(0x8000000000000000ULL));
 431
 432   EXPECT_EQ(10u, getULEB128Size(UINT64_MAX));
 433 }
 434
 435 }  // anonymous namespace