diff options
Diffstat (limited to 'llvm/unittests/Support')
| -rw-r--r-- | llvm/unittests/Support/EndianTest.cpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/llvm/unittests/Support/EndianTest.cpp b/llvm/unittests/Support/EndianTest.cpp index ee236d0eec9..c2b5572e574 100644 --- a/llvm/unittests/Support/EndianTest.cpp +++ b/llvm/unittests/Support/EndianTest.cpp @@ -50,6 +50,23 @@ TEST(Endian, ReadBitAligned) { 0x0f000000); EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 4)), 0x0f000000); + // Test to make sure left shift of start bit doesn't overflow. + EXPECT_EQ( + (endian::readAtBitAlignment<int, little, unaligned>(&littleval2[0], 1)), + 0x78000000); + EXPECT_EQ((endian::readAtBitAlignment<int, big, unaligned>(&bigval2[0], 1)), + 0x78000000); + // Test to make sure 64-bit int doesn't overflow. + unsigned char littleval3[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; + unsigned char bigval3[] = {0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; + EXPECT_EQ((endian::readAtBitAlignment<int64_t, little, unaligned>( + &littleval3[0], 4)), + 0x0f00000000000000); + EXPECT_EQ( + (endian::readAtBitAlignment<int64_t, big, unaligned>(&bigval3[0], 4)), + 0x0f00000000000000); } TEST(Endian, WriteBitAligned) { @@ -78,6 +95,73 @@ TEST(Endian, WriteBitAligned) { EXPECT_EQ(littleval[5], 0x00); EXPECT_EQ(littleval[6], 0x00); EXPECT_EQ(littleval[7], 0x00); + + // This test makes sure 1<<31 doesn't overflow. + // Test to make sure left shift of start bit doesn't overflow. + unsigned char bigval2[8] = {0x00}; + endian::writeAtBitAlignment<int32_t, big, unaligned>(bigval2, (int)0xffffffff, + 1); + EXPECT_EQ(bigval2[0], 0xff); + EXPECT_EQ(bigval2[1], 0xff); + EXPECT_EQ(bigval2[2], 0xff); + EXPECT_EQ(bigval2[3], 0xfe); + EXPECT_EQ(bigval2[4], 0x00); + EXPECT_EQ(bigval2[5], 0x00); + EXPECT_EQ(bigval2[6], 0x00); + EXPECT_EQ(bigval2[7], 0x01); + + unsigned char littleval2[8] = {0x00}; + endian::writeAtBitAlignment<int32_t, little, unaligned>(littleval2, + (int)0xffffffff, 1); + EXPECT_EQ(littleval2[0], 0xfe); + EXPECT_EQ(littleval2[1], 0xff); + EXPECT_EQ(littleval2[2], 0xff); + EXPECT_EQ(littleval2[3], 0xff); + EXPECT_EQ(littleval2[4], 0x01); + EXPECT_EQ(littleval2[5], 0x00); + EXPECT_EQ(littleval2[6], 0x00); + EXPECT_EQ(littleval2[7], 0x00); + + // Test to make sure 64-bit int doesn't overflow. + unsigned char bigval64[16] = {0x00}; + endian::writeAtBitAlignment<int64_t, big, unaligned>( + bigval64, (int64_t)0xffffffffffffffff, 1); + EXPECT_EQ(bigval64[0], 0xff); + EXPECT_EQ(bigval64[1], 0xff); + EXPECT_EQ(bigval64[2], 0xff); + EXPECT_EQ(bigval64[3], 0xff); + EXPECT_EQ(bigval64[4], 0xff); + EXPECT_EQ(bigval64[5], 0xff); + EXPECT_EQ(bigval64[6], 0xff); + EXPECT_EQ(bigval64[7], 0xfe); + EXPECT_EQ(bigval64[8], 0x00); + EXPECT_EQ(bigval64[9], 0x00); + EXPECT_EQ(bigval64[10], 0x00); + EXPECT_EQ(bigval64[11], 0x00); + EXPECT_EQ(bigval64[12], 0x00); + EXPECT_EQ(bigval64[13], 0x00); + EXPECT_EQ(bigval64[14], 0x00); + EXPECT_EQ(bigval64[15], 0x01); + + unsigned char littleval64[16] = {0x00}; + endian::writeAtBitAlignment<int64_t, little, unaligned>( + littleval64, (int64_t)0xffffffffffffffff, 1); + EXPECT_EQ(littleval64[0], 0xfe); + EXPECT_EQ(littleval64[1], 0xff); + EXPECT_EQ(littleval64[2], 0xff); + EXPECT_EQ(littleval64[3], 0xff); + EXPECT_EQ(littleval64[4], 0xff); + EXPECT_EQ(littleval64[5], 0xff); + EXPECT_EQ(littleval64[6], 0xff); + EXPECT_EQ(littleval64[7], 0xff); + EXPECT_EQ(littleval64[8], 0x01); + EXPECT_EQ(littleval64[9], 0x00); + EXPECT_EQ(littleval64[10], 0x00); + EXPECT_EQ(littleval64[11], 0x00); + EXPECT_EQ(littleval64[12], 0x00); + EXPECT_EQ(littleval64[13], 0x00); + EXPECT_EQ(littleval64[14], 0x00); + EXPECT_EQ(littleval64[15], 0x00); } TEST(Endian, Write) { |
