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The DWARF file format uses both unsigned and signed LEB128 encoding for various fields. [ 2 ] LLVM , in its Coverage Mapping Format [ 8 ] LLVM's implementation of LEB128 encoding and decoding is useful alongside the pseudocode above.
PER Aligned: a fixed number of bits if the integer type has a finite range and the size of the range is less than 65536; a variable number of octets otherwise; OER: 1, 2, or 4 octets (either signed or unsigned) if the integer type has a finite range that fits in that number of octets; a variable number of octets otherwise
Actual type can be either signed or unsigned. It contains CHAR_BIT bits. [3] ≥8 %c [CHAR_MIN, CHAR_MAX] — signed char: Of the same size as char, but guaranteed to be signed. Capable of containing at least the [−127, +127] range. [3] [a] ≥8 %c [b] [SCHAR_MIN, SCHAR_MAX] [6] — unsigned char: Of the same size as char, but guaranteed to be
In a move or convert operation, zero extension refers to setting the high bits of the destination to zero, rather than setting them to a copy of the most significant bit of the source. If the source of the operation is an unsigned number, then zero extension is usually the correct way to move it to a larger field while preserving its numeric ...
Size Size Names Signed range (two's complement representation) Unsigned range 1 byte 8 bits Byte, octet, minimum size of char in C99( see limits.h CHAR_BIT) −128 to +127 0 to 255 2 bytes 16 bits x86 word, minimum size of short and int in C −32,768 to +32,767 0 to 65,535 4 bytes 32 bits
signed char: unsigned char: short: unsigned short: long: unsigned long: long long: unsigned long long: int: unsigned int: C++ (C++11 variable-width) Objective-C signed char or int8_t: unsigned char or uint8_t: short or int16_t: unsigned short or uint16_t: int or int32_t: unsigned int or uint32_t: long long or int64_t: unsigned long long or uint64_t
For Integers, the unsigned modifier defines the type to be unsigned. The default integer signedness outside bit-fields is signed, but can be set explicitly with signed modifier. By contrast, the C standard declares signed char, unsigned char, and char, to be three distinct types, but specifies that all three must have the same size and alignment.
LEB128 uses two's complement to represent signed numbers. In this scheme of representation, n bits encode a range from −2 n to 2 n − 1, and all negative numbers start with a 1 in the most significant bit. In Signed LEB128, the input is sign-extended so that its length is a multiple of 7 bits. From there the encoding proceeds as usual.