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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:

Public Attributes

uchar n
 Number of operand (0,1,2). More...
 
optype_t type
 Type of operand (see Operand types)
 
char offb
 Offset of operand value from the instruction start (0 means unknown). More...
 
char offo
 Same as offb (some operands have 2 numeric values used to form an operand). More...
 
uchar flags
 Operand flags
 
op_dtype_t dtype
 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
 
char specflag2
 
char specflag3
 
char specflag4
 

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

uchar op_t::n

Number of operand (0,1,2).

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

char op_t::offb

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).

char op_t::offo

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.

op_dtype_t op_t::dtype

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.

uint16 op_t::phrase

number of register phrase (o_phrase,o_displ).

you yourself define numbers of phrases as you like

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 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.

ea_t op_t::addr

virtual address pointed or used by the operand.

(o_mem,o_displ,o_far,o_near)

ea_t op_t::specval

This field may be used as you want.


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