op_t Class Reference

Detailed Description

Operand of an instruction.

This structure is filled by the analyzer. Upon entrance to the analyzer, some fields of this structure are initialized:

• type: o_void
• offb: 0
• offo: 0
• flags: OF_SHOW

Public Attributes
uchar	n = 0
	Number of operand (0,1,2). More...
optype_t	type = o_void
	Type of operand (see Operand types)
char	offb = 0
	Offset of operand value from the instruction start (0 means unknown). More...
char	offo = 0
	Same as offb (some operands have 2 numeric values used to form an operand). More...
uchar	flags = 0
	Operand flags
op_dtype_t	dtype = 0
	Type of operand value (see Operand value types). More...
union {
uint16   reg
	number of register (o_reg)
uint16   phrase
	number of register phrase (o_phrase,o_displ). More...
};
union {
uval_t   value
	operand value (o_imm) or outer displacement (o_displ+OF_OUTER_DISP). More...
struct {
uint16   low
uint16   high
}   value_shorts
	This structure is defined for your convenience only.
};
union {
ea_t   addr
	virtual address pointed or used by the operand. More...
struct {
uint16   low
uint16   high
}   addr_shorts
	This structure is defined for your convenience only.
};
union {
ea_t   specval
	This field may be used as you want. More...
struct {
uint16   low
	IBM PC: segment register number (o_mem,o_far,o_near)
uint16   high
	IBM PC: segment selector value (o_mem,o_far,o_near)
}   specval_shorts
	This structure is defined for your convenience only.
};
Special flags
The following fields are used only in idp modules. You may use them as you want to store additional information about the operand.
char	specflag1 = 0
char	specflag2 = 0
char	specflag3 = 0
char	specflag4 = 0

Public Member Functions
void	set_shown ()
	Set operand to be shown.
void	clr_shown ()
	Set operand to hidden.
bool	shown () const
	Is operand set to be shown?
bool	is_reg (int r) const
	Is register operand?
bool	is_imm (uval_t v) const
	Is immediate operand?

Member Data Documentation

n

uchar op_t::n = 0

Number of operand (0,1,2).

Initialized once at the start of work. You have no right to change its value.

offb

char op_t::offb = 0

Offset of operand value from the instruction start (0 means unknown).

Of course this field is meaningful only for certain types of operands. Leave it equal to zero if the operand has no offset. This offset should point to the 'interesting' part of operand. For example, it may point to the address of a function in

call func 

or it may point to bytes holding '5' in

mov  ax, [bx+5] 

Usually bytes pointed to this offset are relocated (have fixup information).

offo

char op_t::offo = 0

Same as offb (some operands have 2 numeric values used to form an operand).

This field is used for the second part of operand if it exists. Currently this field is used only for outer offsets of Motorola processors. Leave it equal to zero if the operand has no offset.

dtype

op_dtype_t op_t::dtype = 0

Type of operand value (see Operand value types).

Usually first 9 types are used. This is the type of the operand itself, not the size of the addressing mode. for example, byte ptr [epb+32_bit_offset] will have dt_byte type.

phrase

uint16 op_t::phrase

number of register phrase (o_phrase,o_displ).

you yourself define numbers of phrases as you like

value

uval_t op_t::value

operand value (o_imm) or outer displacement (o_displ+OF_OUTER_DISP).

integer values should be in IDA's (little-endian) order. when using ieee_realcvt(), floating point values should be in the processor's native byte order. dt_double and dt_qword values take up 8 bytes (value and addr fields for 32-bit modules). NB: in case a dt_dword/dt_qword immediate is forced to float by user, the kernel converts it to processor's native order before calling FP conversion routines.

addr

ea_t op_t::addr

virtual address pointed or used by the operand.

(o_mem,o_displ,o_far,o_near)

specval

ea_t op_t::specval

This field may be used as you want.

---

The documentation for this class was generated from the following file:

• ua.hpp