//===- llvm/unittest/Support/LEB128Test.cpp - LEB128 function tests -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
using namespace llvm;
namespace {
TEST(LEB128Test, EncodeSLEB128) {
#define EXPECT_SLEB128_EQ(EXPECTED, VALUE) \
do { \
/* encodeSLEB128(uint64_t, raw_ostream &) */ \
std::string Expected(EXPECTED, sizeof(EXPECTED) - 1); \
std::string Actual; \
raw_string_ostream Stream(Actual); \
encodeSLEB128(VALUE, Stream); \
Stream.flush(); \
EXPECT_EQ(Expected, Actual); \
} while (0)
// Encode SLEB128
EXPECT_SLEB128_EQ("\x00", 0);
EXPECT_SLEB128_EQ("\x01", 1);
EXPECT_SLEB128_EQ("\x7f", -1);
EXPECT_SLEB128_EQ("\x3f", 63);
EXPECT_SLEB128_EQ("\x41", -63);
EXPECT_SLEB128_EQ("\x40", -64);
EXPECT_SLEB128_EQ("\xbf\x7f", -65);
EXPECT_SLEB128_EQ("\xc0\x00", 64);
#undef EXPECT_SLEB128_EQ
}
TEST(LEB128Test, EncodeULEB128) {
#define EXPECT_ULEB128_EQ(EXPECTED, VALUE, PAD) \
do { \
std::string Expected(EXPECTED, sizeof(EXPECTED) - 1); \
\
/* encodeULEB128(uint64_t, raw_ostream &, unsigned) */ \
std::string Actual1; \
raw_string_ostream Stream(Actual1); \
encodeULEB128(VALUE, Stream, PAD); \
Stream.flush(); \
EXPECT_EQ(Expected, Actual1); \
\
/* encodeULEB128(uint64_t, uint8_t *, unsigned) */ \
uint8_t Buffer[32]; \
unsigned Size = encodeULEB128(VALUE, Buffer, PAD); \
std::string Actual2(reinterpret_cast<const char *>(Buffer), Size); \
EXPECT_EQ(Expected, Actual2); \
} while (0)
// Encode ULEB128
EXPECT_ULEB128_EQ("\x00", 0, 0);
EXPECT_ULEB128_EQ("\x01", 1, 0);
EXPECT_ULEB128_EQ("\x3f", 63, 0);
EXPECT_ULEB128_EQ("\x40", 64, 0);
EXPECT_ULEB128_EQ("\x7f", 0x7f, 0);
EXPECT_ULEB128_EQ("\x80\x01", 0x80, 0);
EXPECT_ULEB128_EQ("\x81\x01", 0x81, 0);
EXPECT_ULEB128_EQ("\x90\x01", 0x90, 0);
EXPECT_ULEB128_EQ("\xff\x01", 0xff, 0);
EXPECT_ULEB128_EQ("\x80\x02", 0x100, 0);
EXPECT_ULEB128_EQ("\x81\x02", 0x101, 0);
// Encode ULEB128 with some extra padding bytes
EXPECT_ULEB128_EQ("\x80\x00", 0, 1);
EXPECT_ULEB128_EQ("\x80\x80\x00", 0, 2);
EXPECT_ULEB128_EQ("\xff\x00", 0x7f, 1);
EXPECT_ULEB128_EQ("\xff\x80\x00", 0x7f, 2);
EXPECT_ULEB128_EQ("\x80\x81\x00", 0x80, 1);
EXPECT_ULEB128_EQ("\x80\x81\x80\x00", 0x80, 2);
#undef EXPECT_ULEB128_EQ
}
TEST(LEB128Test, DecodeULEB128) {
#define EXPECT_DECODE_ULEB128_EQ(EXPECTED, VALUE) \
do { \
unsigned ActualSize = 0; \
uint64_t Actual = decodeULEB128(reinterpret_cast<const uint8_t *>(VALUE), \
&ActualSize); \
EXPECT_EQ(sizeof(VALUE) - 1, ActualSize); \
EXPECT_EQ(EXPECTED, Actual); \
} while (0)
// Decode ULEB128
EXPECT_DECODE_ULEB128_EQ(0u, "\x00");
EXPECT_DECODE_ULEB128_EQ(1u, "\x01");
EXPECT_DECODE_ULEB128_EQ(63u, "\x3f");
EXPECT_DECODE_ULEB128_EQ(64u, "\x40");
EXPECT_DECODE_ULEB128_EQ(0x7fu, "\x7f");
EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x01");
EXPECT_DECODE_ULEB128_EQ(0x81u, "\x81\x01");
EXPECT_DECODE_ULEB128_EQ(0x90u, "\x90\x01");
EXPECT_DECODE_ULEB128_EQ(0xffu, "\xff\x01");
EXPECT_DECODE_ULEB128_EQ(0x100u, "\x80\x02");
EXPECT_DECODE_ULEB128_EQ(0x101u, "\x81\x02");
EXPECT_DECODE_ULEB128_EQ(4294975616ULL, "\x80\xc1\x80\x80\x10");
// Decode ULEB128 with extra padding bytes
EXPECT_DECODE_ULEB128_EQ(0u, "\x80\x00");
EXPECT_DECODE_ULEB128_EQ(0u, "\x80\x80\x00");
EXPECT_DECODE_ULEB128_EQ(0x7fu, "\xff\x00");
EXPECT_DECODE_ULEB128_EQ(0x7fu, "\xff\x80\x00");
EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x00");
EXPECT_DECODE_ULEB128_EQ(0x80u, "\x80\x81\x80\x00");
#undef EXPECT_DECODE_ULEB128_EQ
}
TEST(LEB128Test, DecodeSLEB128) {
#define EXPECT_DECODE_SLEB128_EQ(EXPECTED, VALUE) \
do { \
unsigned ActualSize = 0; \
int64_t Actual = decodeSLEB128(reinterpret_cast<const uint8_t *>(VALUE), \
&ActualSize); \
EXPECT_EQ(sizeof(VALUE) - 1, ActualSize); \
EXPECT_EQ(EXPECTED, Actual); \
} while (0)
// Decode SLEB128
EXPECT_DECODE_SLEB128_EQ(0L, "\x00");
EXPECT_DECODE_SLEB128_EQ(1L, "\x01");
EXPECT_DECODE_SLEB128_EQ(63L, "\x3f");
EXPECT_DECODE_SLEB128_EQ(-64L, "\x40");
EXPECT_DECODE_SLEB128_EQ(-63L, "\x41");
EXPECT_DECODE_SLEB128_EQ(-1L, "\x7f");
EXPECT_DECODE_SLEB128_EQ(128L, "\x80\x01");
EXPECT_DECODE_SLEB128_EQ(129L, "\x81\x01");
EXPECT_DECODE_SLEB128_EQ(-129L, "\xff\x7e");
EXPECT_DECODE_SLEB128_EQ(-128L, "\x80\x7f");
EXPECT_DECODE_SLEB128_EQ(-127L, "\x81\x7f");
EXPECT_DECODE_SLEB128_EQ(64L, "\xc0\x00");
EXPECT_DECODE_SLEB128_EQ(-12345L, "\xc7\x9f\x7f");
// Decode unnormalized SLEB128 with extra padding bytes.
EXPECT_DECODE_SLEB128_EQ(0L, "\x80\x00");
EXPECT_DECODE_SLEB128_EQ(0L, "\x80\x80\x00");
EXPECT_DECODE_SLEB128_EQ(0x7fL, "\xff\x00");
EXPECT_DECODE_SLEB128_EQ(0x7fL, "\xff\x80\x00");
EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x00");
EXPECT_DECODE_SLEB128_EQ(0x80L, "\x80\x81\x80\x00");
#undef EXPECT_DECODE_SLEB128_EQ
}
TEST(LEB128Test, SLEB128Size) {
// Positive Value Testing Plan:
// (1) 128 ^ n - 1 ........ need (n+1) bytes
// (2) 128 ^ n ............ need (n+1) bytes
// (3) 128 ^ n * 63 ....... need (n+1) bytes
// (4) 128 ^ n * 64 - 1 ... need (n+1) bytes
// (5) 128 ^ n * 64 ....... need (n+2) bytes
EXPECT_EQ(1u, getSLEB128Size(0x0LL));
EXPECT_EQ(1u, getSLEB128Size(0x1LL));
EXPECT_EQ(1u, getSLEB128Size(0x3fLL));
EXPECT_EQ(1u, getSLEB128Size(0x3fLL));
EXPECT_EQ(2u, getSLEB128Size(0x40LL));
EXPECT_EQ(2u, getSLEB128Size(0x7fLL));
EXPECT_EQ(2u, getSLEB128Size(0x80LL));
EXPECT_EQ(2u, getSLEB128Size(0x1f80LL));
EXPECT_EQ(2u, getSLEB128Size(0x1fffLL));
EXPECT_EQ(3u, getSLEB128Size(0x2000LL));
EXPECT_EQ(3u, getSLEB128Size(0x3fffLL));
EXPECT_EQ(3u, getSLEB128Size(0x4000LL));
EXPECT_EQ(3u, getSLEB128Size(0xfc000LL));
EXPECT_EQ(3u, getSLEB128Size(0xfffffLL));
EXPECT_EQ(4u, getSLEB128Size(0x100000LL));
EXPECT_EQ(4u, getSLEB128Size(0x1fffffLL));
EXPECT_EQ(4u, getSLEB128Size(0x200000LL));
EXPECT_EQ(4u, getSLEB128Size(0x7e00000LL));
EXPECT_EQ(4u, getSLEB128Size(0x7ffffffLL));
EXPECT_EQ(5u, getSLEB128Size(0x8000000LL));
EXPECT_EQ(5u, getSLEB128Size(0xfffffffLL));
EXPECT_EQ(5u, getSLEB128Size(0x10000000LL));
EXPECT_EQ(5u, getSLEB128Size(0x3f0000000LL));
EXPECT_EQ(5u, getSLEB128Size(0x3ffffffffLL));
EXPECT_EQ(6u, getSLEB128Size(0x400000000LL));
EXPECT_EQ(6u, getSLEB128Size(0x7ffffffffLL));
EXPECT_EQ(6u, getSLEB128Size(0x800000000LL));
EXPECT_EQ(6u, getSLEB128Size(0x1f800000000LL));
EXPECT_EQ(6u, getSLEB128Size(0x1ffffffffffLL));
EXPECT_EQ(7u, getSLEB128Size(0x20000000000LL));
EXPECT_EQ(7u, getSLEB128Size(0x3ffffffffffLL));
EXPECT_EQ(7u, getSLEB128Size(0x40000000000LL));
EXPECT_EQ(7u, getSLEB128Size(0xfc0000000000LL));
EXPECT_EQ(7u, getSLEB128Size(0xffffffffffffLL));
EXPECT_EQ(8u, getSLEB128Size(0x1000000000000LL));
EXPECT_EQ(8u, getSLEB128Size(0x1ffffffffffffLL));
EXPECT_EQ(8u, getSLEB128Size(0x2000000000000LL));
EXPECT_EQ(8u, getSLEB128Size(0x7e000000000000LL));
EXPECT_EQ(8u, getSLEB128Size(0x7fffffffffffffLL));
EXPECT_EQ(9u, getSLEB128Size(0x80000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(0xffffffffffffffLL));
EXPECT_EQ(9u, getSLEB128Size(0x100000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(0x3f00000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(0x3fffffffffffffffLL));
EXPECT_EQ(10u, getSLEB128Size(0x4000000000000000LL));
EXPECT_EQ(10u, getSLEB128Size(0x7fffffffffffffffLL));
EXPECT_EQ(10u, getSLEB128Size(INT64_MAX));
// Negative Value Testing Plan:
// (1) - 128 ^ n - 1 ........ need (n+1) bytes
// (2) - 128 ^ n ............ need (n+1) bytes
// (3) - 128 ^ n * 63 ....... need (n+1) bytes
// (4) - 128 ^ n * 64 ....... need (n+1) bytes (different from positive one)
// (5) - 128 ^ n * 65 - 1 ... need (n+2) bytes (if n > 0)
// (6) - 128 ^ n * 65 ....... need (n+2) bytes
EXPECT_EQ(1u, getSLEB128Size(0x0LL));
EXPECT_EQ(1u, getSLEB128Size(-0x1LL));
EXPECT_EQ(1u, getSLEB128Size(-0x3fLL));
EXPECT_EQ(1u, getSLEB128Size(-0x40LL));
EXPECT_EQ(1u, getSLEB128Size(-0x40LL)); // special case
EXPECT_EQ(2u, getSLEB128Size(-0x41LL));
EXPECT_EQ(2u, getSLEB128Size(-0x7fLL));
EXPECT_EQ(2u, getSLEB128Size(-0x80LL));
EXPECT_EQ(2u, getSLEB128Size(-0x1f80LL));
EXPECT_EQ(2u, getSLEB128Size(-0x2000LL));
EXPECT_EQ(3u, getSLEB128Size(-0x207fLL));
EXPECT_EQ(3u, getSLEB128Size(-0x2080LL));
EXPECT_EQ(3u, getSLEB128Size(-0x3fffLL));
EXPECT_EQ(3u, getSLEB128Size(-0x4000LL));
EXPECT_EQ(3u, getSLEB128Size(-0xfc000LL));
EXPECT_EQ(3u, getSLEB128Size(-0x100000LL));
EXPECT_EQ(4u, getSLEB128Size(-0x103fffLL));
EXPECT_EQ(4u, getSLEB128Size(-0x104000LL));
EXPECT_EQ(4u, getSLEB128Size(-0x1fffffLL));
EXPECT_EQ(4u, getSLEB128Size(-0x200000LL));
EXPECT_EQ(4u, getSLEB128Size(-0x7e00000LL));
EXPECT_EQ(4u, getSLEB128Size(-0x8000000LL));
EXPECT_EQ(5u, getSLEB128Size(-0x81fffffLL));
EXPECT_EQ(5u, getSLEB128Size(-0x8200000LL));
EXPECT_EQ(5u, getSLEB128Size(-0xfffffffLL));
EXPECT_EQ(5u, getSLEB128Size(-0x10000000LL));
EXPECT_EQ(5u, getSLEB128Size(-0x3f0000000LL));
EXPECT_EQ(5u, getSLEB128Size(-0x400000000LL));
EXPECT_EQ(6u, getSLEB128Size(-0x40fffffffLL));
EXPECT_EQ(6u, getSLEB128Size(-0x410000000LL));
EXPECT_EQ(6u, getSLEB128Size(-0x7ffffffffLL));
EXPECT_EQ(6u, getSLEB128Size(-0x800000000LL));
EXPECT_EQ(6u, getSLEB128Size(-0x1f800000000LL));
EXPECT_EQ(6u, getSLEB128Size(-0x20000000000LL));
EXPECT_EQ(7u, getSLEB128Size(-0x207ffffffffLL));
EXPECT_EQ(7u, getSLEB128Size(-0x20800000000LL));
EXPECT_EQ(7u, getSLEB128Size(-0x3ffffffffffLL));
EXPECT_EQ(7u, getSLEB128Size(-0x40000000000LL));
EXPECT_EQ(7u, getSLEB128Size(-0xfc0000000000LL));
EXPECT_EQ(7u, getSLEB128Size(-0x1000000000000LL));
EXPECT_EQ(8u, getSLEB128Size(-0x103ffffffffffLL));
EXPECT_EQ(8u, getSLEB128Size(-0x1040000000000LL));
EXPECT_EQ(8u, getSLEB128Size(-0x1ffffffffffffLL));
EXPECT_EQ(8u, getSLEB128Size(-0x2000000000000LL));
EXPECT_EQ(8u, getSLEB128Size(-0x7e000000000000LL));
EXPECT_EQ(8u, getSLEB128Size(-0x80000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(-0x81ffffffffffffLL));
EXPECT_EQ(9u, getSLEB128Size(-0x82000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(-0xffffffffffffffLL));
EXPECT_EQ(9u, getSLEB128Size(-0x100000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(-0x3f00000000000000LL));
EXPECT_EQ(9u, getSLEB128Size(-0x4000000000000000LL));
EXPECT_EQ(10u, getSLEB128Size(-0x40ffffffffffffffLL));
EXPECT_EQ(10u, getSLEB128Size(-0x4100000000000000LL));
EXPECT_EQ(10u, getSLEB128Size(-0x7fffffffffffffffLL));
EXPECT_EQ(10u, getSLEB128Size(-0x8000000000000000LL));
EXPECT_EQ(10u, getSLEB128Size(INT64_MIN));
}
TEST(LEB128Test, ULEB128Size) {
// Testing Plan:
// (1) 128 ^ n ............ need (n+1) bytes
// (2) 128 ^ n * 64 ....... need (n+1) bytes
// (3) 128 ^ (n+1) - 1 .... need (n+1) bytes
EXPECT_EQ(1u, getULEB128Size(0)); // special case
EXPECT_EQ(1u, getULEB128Size(0x1ULL));
EXPECT_EQ(1u, getULEB128Size(0x40ULL));
EXPECT_EQ(1u, getULEB128Size(0x7fULL));
EXPECT_EQ(2u, getULEB128Size(0x80ULL));
EXPECT_EQ(2u, getULEB128Size(0x2000ULL));
EXPECT_EQ(2u, getULEB128Size(0x3fffULL));
EXPECT_EQ(3u, getULEB128Size(0x4000ULL));
EXPECT_EQ(3u, getULEB128Size(0x100000ULL));
EXPECT_EQ(3u, getULEB128Size(0x1fffffULL));
EXPECT_EQ(4u, getULEB128Size(0x200000ULL));
EXPECT_EQ(4u, getULEB128Size(0x8000000ULL));
EXPECT_EQ(4u, getULEB128Size(0xfffffffULL));
EXPECT_EQ(5u, getULEB128Size(0x10000000ULL));
EXPECT_EQ(5u, getULEB128Size(0x400000000ULL));
EXPECT_EQ(5u, getULEB128Size(0x7ffffffffULL));
EXPECT_EQ(6u, getULEB128Size(0x800000000ULL));
EXPECT_EQ(6u, getULEB128Size(0x20000000000ULL));
EXPECT_EQ(6u, getULEB128Size(0x3ffffffffffULL));
EXPECT_EQ(7u, getULEB128Size(0x40000000000ULL));
EXPECT_EQ(7u, getULEB128Size(0x1000000000000ULL));
EXPECT_EQ(7u, getULEB128Size(0x1ffffffffffffULL));
EXPECT_EQ(8u, getULEB128Size(0x2000000000000ULL));
EXPECT_EQ(8u, getULEB128Size(0x80000000000000ULL));
EXPECT_EQ(8u, getULEB128Size(0xffffffffffffffULL));
EXPECT_EQ(9u, getULEB128Size(0x100000000000000ULL));
EXPECT_EQ(9u, getULEB128Size(0x4000000000000000ULL));
EXPECT_EQ(9u, getULEB128Size(0x7fffffffffffffffULL));
EXPECT_EQ(10u, getULEB128Size(0x8000000000000000ULL));
EXPECT_EQ(10u, getULEB128Size(UINT64_MAX));
}
} // anonymous namespace