53 lines
782 B
Go
53 lines
782 B
Go
package operand
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/mmcloughlin/avo/reg"
|
|
)
|
|
|
|
type Op interface {
|
|
Asm() string
|
|
}
|
|
|
|
type Mem struct {
|
|
Disp int
|
|
Base reg.Register
|
|
Index reg.Register
|
|
Scale uint8
|
|
}
|
|
|
|
func (m Mem) Asm() string {
|
|
a := ""
|
|
if m.Disp != 0 {
|
|
a += fmt.Sprintf("%d", m.Disp)
|
|
}
|
|
if m.Base != nil {
|
|
a += fmt.Sprintf("(%s)", m.Base.Asm())
|
|
}
|
|
if m.Index != nil && m.Scale != 0 {
|
|
a += fmt.Sprintf("(%s*%d)", m.Index.Asm(), m.Scale)
|
|
}
|
|
return a
|
|
}
|
|
|
|
type Imm uint64
|
|
|
|
func (i Imm) Asm() string {
|
|
return fmt.Sprintf("%#x", i)
|
|
}
|
|
|
|
// Rel is an offset relative to the instruction pointer.
|
|
type Rel int32
|
|
|
|
func (r Rel) Asm() string {
|
|
return fmt.Sprintf(".%+d", r)
|
|
}
|
|
|
|
// LabelRef is a reference to a label.
|
|
type LabelRef string
|
|
|
|
func (l LabelRef) Asm() string {
|
|
return string(l)
|
|
}
|