[Support] add decodeSLEB128()
We already have routines to encode SLEB128 as well as encode/decode ULEB128.
This last function fills out the matrix. I'll need this for some llvm-objdump
work I am doing.
llvm-svn: 217830
diff --git a/llvm/unittests/Support/LEB128Test.cpp b/llvm/unittests/Support/LEB128Test.cpp
index 14a6d3f..76b63e5 100644
--- a/llvm/unittests/Support/LEB128Test.cpp
+++ b/llvm/unittests/Support/LEB128Test.cpp
@@ -119,6 +119,42 @@
#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