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 char *DefaultValue = VALUE;                                          \
 151     const uint8_t *Value = reinterpret_cast<const uint8_t *>(DefaultValue);    \
 152     const char *Error = nullptr;                                               \
 153     unsigned ErrorOffset = 0;                                                  \
 154     uint64_t Actual =                                                          \
 155         decodeULEB128(Value, &ErrorOffset, Value + strlen(VALUE), &Error);     \
 156     EXPECT_NE(Error, nullptr);                                                 \
 157     EXPECT_EQ(0ul, Actual);                                                    \
 158     EXPECT_EQ(ERROR_OFFSET, ErrorOffset);                                      \
 159     Value = reinterpret_cast<const uint8_t *>(DefaultValue);                   \
 160     Error = nullptr;                                                           \
 161     Actual = decodeULEB128AndInc(Value, Value + strlen(VALUE), &Error);        \
 162     EXPECT_NE(Error, nullptr);                                                 \
 163     EXPECT_EQ(0ul, Actual);                                                    \
 164     EXPECT_EQ(ERROR_OFFSET,                                                    \
 165               Value - reinterpret_cast<const uint8_t *>(DefaultValue));        \
 166   } while (0)
 167
 168   // Buffer overflow.
 169   EXPECT_INVALID_ULEB128("", 0u);
 170   EXPECT_INVALID_ULEB128("\x80", 1u);
 171
 172   // Does not fit in 64 bits.
 173   EXPECT_INVALID_ULEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x02", 9u);
 174   EXPECT_INVALID_ULEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x02", 10u);
 175
 176 #undef EXPECT_INVALID_ULEB128
 177 }
 178
 179 TEST(LEB128Test, DecodeSLEB128) {
 180 #define EXPECT_DECODE_SLEB128_EQ(EXPECTED, VALUE) \
 181   do { \
 182     unsigned ActualSize = 0; \
 183     int64_t Actual = decodeSLEB128(reinterpret_cast<const uint8_t *>(VALUE), \
 184                                     &ActualSize); \
 185     EXPECT_EQ(sizeof(VALUE) - 1, ActualSize); \
 186     EXPECT_EQ(EXPECTED, Actual); \
 187   } while (0)
 188
 189   // Don't crash
 190   EXPECT_EQ(0, decodeSLEB128(nullptr, nullptr, nullptr));
 191
 192   // Decode SLEB128
 193   EXPECT_DECODE_SLEB128_EQ(0L, "\x00");
 194   EXPECT_DECODE_SLEB128_EQ(1L, "\x01");
 195   EXPECT_DECODE_SLEB128_EQ(63L, "\x3f");
 196   EXPECT_DECODE_SLEB128_EQ(-64L, "\x40");
 197   EXPECT_DECODE_SLEB128_EQ(-63L, "\x41");
 198   EXPECT_DECODE_SLEB128_EQ(-1L, "\x7f");
 199   EXPECT_DECODE_SLEB128_EQ(128L, "\x80\x01");
 200   EXPECT_DECODE_SLEB128_EQ(129L, "\x81\x01");
 201   EXPECT_DECODE_SLEB128_EQ(-129L, "\xff\x7e");
 202   EXPECT_DECODE_SLEB128_EQ(-128L, "\x80\x7f");
 203   EXPECT_DECODE_SLEB128_EQ(-127L, "\x81\x7f");
 204   EXPECT_DECODE_SLEB128_EQ(64L, "\xc0\x00");
 205   EXPECT_DECODE_SLEB128_EQ(-12345L, "\xc7\x9f\x7f");
 206
 207   // Decode unnormalized SLEB128 with extra padding bytes.
 208   EXPECT_DECODE_SLEB128_EQ(0L, "\x80\x00");
 209   EXPECT_DECODE_SLEB128_EQ(0L, "\x80\x80\x00");
 210   EXPECT_DECODE_SLEB128_EQ(0x7fL, "\xff\x00");
 211   EXPECT_DECODE_SLEB128_EQ(0x7fL, "\xff\x80\x00");
 212   EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x00");
 213   EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x80\x00");
 214   EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x80\x80\x80\x80\x80\x80\x80\x00");
 215   EXPECT_DECODE_SLEB128_EQ(-2L, "\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F");
 216   EXPECT_DECODE_SLEB128_EQ(INT64_MIN,
 217                            "\x80\x80\x80\x80\x80\x80\x80\x80\x80\x7F");
 218   EXPECT_DECODE_SLEB128_EQ(INT64_MAX,
 219                            "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00");
 220
 221 #undef EXPECT_DECODE_SLEB128_EQ
 222 }
 223
 224 TEST(LEB128Test, DecodeInvalidSLEB128) {
 225 #define EXPECT_INVALID_SLEB128(VALUE, ERROR_OFFSET)                            \
 226   do {                                                                         \
 227     const char *DefaultValue = VALUE;                                          \
 228     const uint8_t *Value = reinterpret_cast<const uint8_t *>(DefaultValue);    \
 229     const char *Error = nullptr;                                               \
 230     unsigned ErrorOffset = 0;                                                  \
 231     uint64_t Actual =                                                          \
 232         decodeSLEB128(Value, &ErrorOffset, Value + strlen(VALUE), &Error);     \
 233     EXPECT_NE(Error, nullptr);                                                 \
 234     EXPECT_EQ(0ul, Actual);                                                    \
 235     EXPECT_EQ(ERROR_OFFSET, ErrorOffset);                                      \
 236     Value = reinterpret_cast<const uint8_t *>(DefaultValue);                   \
 237     Error = nullptr;                                                           \
 238     Actual = decodeSLEB128AndInc(Value, Value + strlen(VALUE), &Error);        \
 239     EXPECT_NE(Error, nullptr);                                                 \
 240     EXPECT_EQ(0ul, Actual);                                                    \
 241     EXPECT_EQ(ERROR_OFFSET,                                                    \
 242               Value - reinterpret_cast<const uint8_t *>(DefaultValue));        \
 243   } while (0)
 244
 245   // Buffer overflow.
 246   EXPECT_INVALID_SLEB128("", 0u);
 247   EXPECT_INVALID_SLEB128("\x80", 1u);
 248
 249   // Does not fit in 64 bits.
 250   EXPECT_INVALID_SLEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01", 9u);
 251   EXPECT_INVALID_SLEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x7E", 9u);
 252   EXPECT_INVALID_SLEB128("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x02", 10u);
 253   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7E", 9u);
 254   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x01", 9u);
 255   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7E", 10u);
 256   EXPECT_INVALID_SLEB128("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", 10u);
 257
 258 #undef EXPECT_INVALID_SLEB128
 259 }
 260
 261 TEST(LEB128Test, DecodeAndInc) {
 262 #define EXPECT_LEB128(FUN, VALUE, SIZE)                                        \
 263   do {                                                                         \
 264     const char *DefaultValue = VALUE;                                          \
 265     const uint8_t *V = reinterpret_cast<const uint8_t *>(DefaultValue),        \
 266                   *P = V;                                                      \
 267     auto Expected = FUN(P), Actual = FUN##AndInc(P, P + strlen(VALUE));        \
 268     EXPECT_EQ(Actual, Expected);                                               \
 269     EXPECT_EQ(P - V, SIZE);                                                    \
 270   } while (0)
 271   EXPECT_LEB128(decodeULEB128, "\x7f", 1);
 272   EXPECT_LEB128(decodeULEB128, "\x80\x01", 2);
 273   EXPECT_LEB128(decodeSLEB128, "\x7f", 1);
 274   EXPECT_LEB128(decodeSLEB128, "\x80\x01", 2);
 275 #undef EXPECT_LEB128
 276
 277 #define EXPECT_LEB128(FUN, VALUE, SIZE)                                        \
 278   do {                                                                         \
 279     const uint8_t *V = reinterpret_cast<const uint8_t *>(VALUE), *P = V;       \
 280     auto Expected = FUN(P), Actual = FUN##AndIncUnsafe(P);                     \
 281     EXPECT_EQ(Actual, Expected);                                               \
 282     EXPECT_EQ(P - V, SIZE);                                                    \
 283   } while (0)
 284   EXPECT_LEB128(decodeULEB128, "\x7f", 1);
 285   EXPECT_LEB128(decodeULEB128, "\x80\x01", 2);
 286 #undef EXPECT_LEB128
 287 }
 288
 289 TEST(LEB128Test, SLEB128Size) {
 290   // Positive Value Testing Plan:
 291   // (1) 128 ^ n - 1 ........ need (n+1) bytes
 292   // (2) 128 ^ n ............ need (n+1) bytes
 293   // (3) 128 ^ n * 63 ....... need (n+1) bytes
 294   // (4) 128 ^ n * 64 - 1 ... need (n+1) bytes
 295   // (5) 128 ^ n * 64 ....... need (n+2) bytes
 296
 297   EXPECT_EQ(1u, getSLEB128Size(0x0LL));
 298   EXPECT_EQ(1u, getSLEB128Size(0x1LL));
 299   EXPECT_EQ(1u, getSLEB128Size(0x3fLL));
 300   EXPECT_EQ(1u, getSLEB128Size(0x3fLL));
 301   EXPECT_EQ(2u, getSLEB128Size(0x40LL));
 302
 303   EXPECT_EQ(2u, getSLEB128Size(0x7fLL));
 304   EXPECT_EQ(2u, getSLEB128Size(0x80LL));
 305   EXPECT_EQ(2u, getSLEB128Size(0x1f80LL));
 306   EXPECT_EQ(2u, getSLEB128Size(0x1fffLL));
 307   EXPECT_EQ(3u, getSLEB128Size(0x2000LL));
 308
 309   EXPECT_EQ(3u, getSLEB128Size(0x3fffLL));
 310   EXPECT_EQ(3u, getSLEB128Size(0x4000LL));
 311   EXPECT_EQ(3u, getSLEB128Size(0xfc000LL));
 312   EXPECT_EQ(3u, getSLEB128Size(0xfffffLL));
 313   EXPECT_EQ(4u, getSLEB128Size(0x100000LL));
 314
 315   EXPECT_EQ(4u, getSLEB128Size(0x1fffffLL));
 316   EXPECT_EQ(4u, getSLEB128Size(0x200000LL));
 317   EXPECT_EQ(4u, getSLEB128Size(0x7e00000LL));
 318   EXPECT_EQ(4u, getSLEB128Size(0x7ffffffLL));
 319   EXPECT_EQ(5u, getSLEB128Size(0x8000000LL));
 320
 321   EXPECT_EQ(5u, getSLEB128Size(0xfffffffLL));
 322   EXPECT_EQ(5u, getSLEB128Size(0x10000000LL));
 323   EXPECT_EQ(5u, getSLEB128Size(0x3f0000000LL));
 324   EXPECT_EQ(5u, getSLEB128Size(0x3ffffffffLL));
 325   EXPECT_EQ(6u, getSLEB128Size(0x400000000LL));
 326
 327   EXPECT_EQ(6u, getSLEB128Size(0x7ffffffffLL));
 328   EXPECT_EQ(6u, getSLEB128Size(0x800000000LL));
 329   EXPECT_EQ(6u, getSLEB128Size(0x1f800000000LL));
 330   EXPECT_EQ(6u, getSLEB128Size(0x1ffffffffffLL));
 331   EXPECT_EQ(7u, getSLEB128Size(0x20000000000LL));
 332
 333   EXPECT_EQ(7u, getSLEB128Size(0x3ffffffffffLL));
 334   EXPECT_EQ(7u, getSLEB128Size(0x40000000000LL));
 335   EXPECT_EQ(7u, getSLEB128Size(0xfc0000000000LL));
 336   EXPECT_EQ(7u, getSLEB128Size(0xffffffffffffLL));
 337   EXPECT_EQ(8u, getSLEB128Size(0x1000000000000LL));
 338
 339   EXPECT_EQ(8u, getSLEB128Size(0x1ffffffffffffLL));
 340   EXPECT_EQ(8u, getSLEB128Size(0x2000000000000LL));
 341   EXPECT_EQ(8u, getSLEB128Size(0x7e000000000000LL));
 342   EXPECT_EQ(8u, getSLEB128Size(0x7fffffffffffffLL));
 343   EXPECT_EQ(9u, getSLEB128Size(0x80000000000000LL));
 344
 345   EXPECT_EQ(9u, getSLEB128Size(0xffffffffffffffLL));
 346   EXPECT_EQ(9u, getSLEB128Size(0x100000000000000LL));
 347   EXPECT_EQ(9u, getSLEB128Size(0x3f00000000000000LL));
 348   EXPECT_EQ(9u, getSLEB128Size(0x3fffffffffffffffLL));
 349   EXPECT_EQ(10u, getSLEB128Size(0x4000000000000000LL));
 350
 351   EXPECT_EQ(10u, getSLEB128Size(0x7fffffffffffffffLL));
 352   EXPECT_EQ(10u, getSLEB128Size(INT64_MAX));
 353
 354   // Negative Value Testing Plan:
 355   // (1) - 128 ^ n - 1 ........ need (n+1) bytes
 356   // (2) - 128 ^ n ............ need (n+1) bytes
 357   // (3) - 128 ^ n * 63 ....... need (n+1) bytes
 358   // (4) - 128 ^ n * 64 ....... need (n+1) bytes (different from positive one)
 359   // (5) - 128 ^ n * 65 - 1 ... need (n+2) bytes (if n > 0)
 360   // (6) - 128 ^ n * 65 ....... need (n+2) bytes
 361
 362   EXPECT_EQ(1u, getSLEB128Size(0x0LL));
 363   EXPECT_EQ(1u, getSLEB128Size(-0x1LL));
 364   EXPECT_EQ(1u, getSLEB128Size(-0x3fLL));
 365   EXPECT_EQ(1u, getSLEB128Size(-0x40LL));
 366   EXPECT_EQ(1u, getSLEB128Size(-0x40LL)); // special case
 367   EXPECT_EQ(2u, getSLEB128Size(-0x41LL));
 368
 369   EXPECT_EQ(2u, getSLEB128Size(-0x7fLL));
 370   EXPECT_EQ(2u, getSLEB128Size(-0x80LL));
 371   EXPECT_EQ(2u, getSLEB128Size(-0x1f80LL));
 372   EXPECT_EQ(2u, getSLEB128Size(-0x2000LL));
 373   EXPECT_EQ(3u, getSLEB128Size(-0x207fLL));
 374   EXPECT_EQ(3u, getSLEB128Size(-0x2080LL));
 375
 376   EXPECT_EQ(3u, getSLEB128Size(-0x3fffLL));
 377   EXPECT_EQ(3u, getSLEB128Size(-0x4000LL));
 378   EXPECT_EQ(3u, getSLEB128Size(-0xfc000LL));
 379   EXPECT_EQ(3u, getSLEB128Size(-0x100000LL));
 380   EXPECT_EQ(4u, getSLEB128Size(-0x103fffLL));
 381   EXPECT_EQ(4u, getSLEB128Size(-0x104000LL));
 382
 383   EXPECT_EQ(4u, getSLEB128Size(-0x1fffffLL));
 384   EXPECT_EQ(4u, getSLEB128Size(-0x200000LL));
 385   EXPECT_EQ(4u, getSLEB128Size(-0x7e00000LL));
 386   EXPECT_EQ(4u, getSLEB128Size(-0x8000000LL));
 387   EXPECT_EQ(5u, getSLEB128Size(-0x81fffffLL));
 388   EXPECT_EQ(5u, getSLEB128Size(-0x8200000LL));
 389
 390   EXPECT_EQ(5u, getSLEB128Size(-0xfffffffLL));
 391   EXPECT_EQ(5u, getSLEB128Size(-0x10000000LL));
 392   EXPECT_EQ(5u, getSLEB128Size(-0x3f0000000LL));
 393   EXPECT_EQ(5u, getSLEB128Size(-0x400000000LL));
 394   EXPECT_EQ(6u, getSLEB128Size(-0x40fffffffLL));
 395   EXPECT_EQ(6u, getSLEB128Size(-0x410000000LL));
 396
 397   EXPECT_EQ(6u, getSLEB128Size(-0x7ffffffffLL));
 398   EXPECT_EQ(6u, getSLEB128Size(-0x800000000LL));
 399   EXPECT_EQ(6u, getSLEB128Size(-0x1f800000000LL));
 400   EXPECT_EQ(6u, getSLEB128Size(-0x20000000000LL));
 401   EXPECT_EQ(7u, getSLEB128Size(-0x207ffffffffLL));
 402   EXPECT_EQ(7u, getSLEB128Size(-0x20800000000LL));
 403
 404   EXPECT_EQ(7u, getSLEB128Size(-0x3ffffffffffLL));
 405   EXPECT_EQ(7u, getSLEB128Size(-0x40000000000LL));
 406   EXPECT_EQ(7u, getSLEB128Size(-0xfc0000000000LL));
 407   EXPECT_EQ(7u, getSLEB128Size(-0x1000000000000LL));
 408   EXPECT_EQ(8u, getSLEB128Size(-0x103ffffffffffLL));
 409   EXPECT_EQ(8u, getSLEB128Size(-0x1040000000000LL));
 410
 411   EXPECT_EQ(8u, getSLEB128Size(-0x1ffffffffffffLL));
 412   EXPECT_EQ(8u, getSLEB128Size(-0x2000000000000LL));
 413   EXPECT_EQ(8u, getSLEB128Size(-0x7e000000000000LL));
 414   EXPECT_EQ(8u, getSLEB128Size(-0x80000000000000LL));
 415   EXPECT_EQ(9u, getSLEB128Size(-0x81ffffffffffffLL));
 416   EXPECT_EQ(9u, getSLEB128Size(-0x82000000000000LL));
 417
 418   EXPECT_EQ(9u, getSLEB128Size(-0xffffffffffffffLL));
 419   EXPECT_EQ(9u, getSLEB128Size(-0x100000000000000LL));
 420   EXPECT_EQ(9u, getSLEB128Size(-0x3f00000000000000LL));
 421   EXPECT_EQ(9u, getSLEB128Size(-0x4000000000000000LL));
 422   EXPECT_EQ(10u, getSLEB128Size(-0x40ffffffffffffffLL));
 423   EXPECT_EQ(10u, getSLEB128Size(-0x4100000000000000LL));
 424
 425   EXPECT_EQ(10u, getSLEB128Size(-0x7fffffffffffffffLL));
 426   EXPECT_EQ(10u, getSLEB128Size(-0x7fffffffffffffffLL - 1));
 427   EXPECT_EQ(10u, getSLEB128Size(INT64_MIN));
 428 }
 429
 430 TEST(LEB128Test, ULEB128Size) {
 431   // Testing Plan:
 432   // (1) 128 ^ n ............ need (n+1) bytes
 433   // (2) 128 ^ n * 64 ....... need (n+1) bytes
 434   // (3) 128 ^ (n+1) - 1 .... need (n+1) bytes
 435
 436   EXPECT_EQ(1u, getULEB128Size(0)); // special case
 437
 438   EXPECT_EQ(1u, getULEB128Size(0x1ULL));
 439   EXPECT_EQ(1u, getULEB128Size(0x40ULL));
 440   EXPECT_EQ(1u, getULEB128Size(0x7fULL));
 441
 442   EXPECT_EQ(2u, getULEB128Size(0x80ULL));
 443   EXPECT_EQ(2u, getULEB128Size(0x2000ULL));
 444   EXPECT_EQ(2u, getULEB128Size(0x3fffULL));
 445
 446   EXPECT_EQ(3u, getULEB128Size(0x4000ULL));
 447   EXPECT_EQ(3u, getULEB128Size(0x100000ULL));
 448   EXPECT_EQ(3u, getULEB128Size(0x1fffffULL));
 449
 450   EXPECT_EQ(4u, getULEB128Size(0x200000ULL));
 451   EXPECT_EQ(4u, getULEB128Size(0x8000000ULL));
 452   EXPECT_EQ(4u, getULEB128Size(0xfffffffULL));
 453
 454   EXPECT_EQ(5u, getULEB128Size(0x10000000ULL));
 455   EXPECT_EQ(5u, getULEB128Size(0x400000000ULL));
 456   EXPECT_EQ(5u, getULEB128Size(0x7ffffffffULL));
 457
 458   EXPECT_EQ(6u, getULEB128Size(0x800000000ULL));
 459   EXPECT_EQ(6u, getULEB128Size(0x20000000000ULL));
 460   EXPECT_EQ(6u, getULEB128Size(0x3ffffffffffULL));
 461
 462   EXPECT_EQ(7u, getULEB128Size(0x40000000000ULL));
 463   EXPECT_EQ(7u, getULEB128Size(0x1000000000000ULL));
 464   EXPECT_EQ(7u, getULEB128Size(0x1ffffffffffffULL));
 465
 466   EXPECT_EQ(8u, getULEB128Size(0x2000000000000ULL));
 467   EXPECT_EQ(8u, getULEB128Size(0x80000000000000ULL));
 468   EXPECT_EQ(8u, getULEB128Size(0xffffffffffffffULL));
 469
 470   EXPECT_EQ(9u, getULEB128Size(0x100000000000000ULL));
 471   EXPECT_EQ(9u, getULEB128Size(0x4000000000000000ULL));
 472   EXPECT_EQ(9u, getULEB128Size(0x7fffffffffffffffULL));
 473
 474   EXPECT_EQ(10u, getULEB128Size(0x8000000000000000ULL));
 475
 476   EXPECT_EQ(10u, getULEB128Size(UINT64_MAX));
 477 }
 478
 479 }  // anonymous namespace