UVSOCK Data Types

The UVSOCK data types are designed for easy implementation on a x86-based architecture without conversion. The table lists the types.

Data types and size

Data Type	Width (bits)
bit	1
(unsigned) char	8
(unsigned) short	16
(unsigned) short int	16
(unsigned) int	32
(unsigned) long	32
(unsigned) long int	32
(unsigned) int64	64
float	32
double	64
ptr	32
union	32
struct	32
func	32
string	32
enum	32
field	32

Endianness
All types use the conventions of x86 processors. That is, they are byte little endian.

Integer Signing
Negative integer numbers are represented as 2's complement.

Floating Point Encoding
Floating point numbers are represented according to IEEE 754 Standard for Binary Floating-Point Arithmetic (IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985)).

The Variant Data Type
The Variant Data Type is returned by several functions in UVSOCK and defined in VTT_TYPE. It contains a raw value that should be interpreted as indicated by the Value Type (vType). This is necessary because in some cases the result type is not known beforehand, for example, when reading a Virtual Register (VTR).

C declaration of the Variant Data Type:

typedef struct tval  {
  int              vType;  // VTREG Result-Type
  union  {                 // member depends on ''vType'
    unsigned long     ul;
    signed char       sc;
    unsigned char     uc;
    signed short     i16;
    unsigned short   u16;
    signed long        l;
    int                i;
    __int64          i64;
    unsigned __int64 u64;
    float              f;
    double             d;
  } v;
} TVAL;

Definitions of the Value Type (vType):

        //Type         // Element access in C union:
#define VTT_void    0  // ---
#define VTT_bit     1  // v.i & 1
#define VTT_char    2  // v.sc
#define VTT_uchar   3  // v.uc
#define VTT_int     4  // v.i
#define VTT_uint    5  // v.ul
#define VTT_short   6  // v.i16
#define VTT_ushort  7  // v.u16
#define VTT_long    8  // v.l
#define VTT_ulong   9  // v.ul
#define VTT_float  10  // v.f
#define VTT_double 11  // v.d
#define VTT_ptr    12  // v.ul
#define VTT_union  13  // ---
#define VTT_struct 14  // ---
#define VTT_func   15  // ---
#define VTT_string 16  // ---
#define VTT_enum   17  // ---
#define VTT_field  18  // ---
#define VTT_int64  19  // v.i64
#define VTT_uint64 20  // v.u64