Improved assembler

src/asm/Instruction.go

@@ -1,8 +1,38 @@
 package asm
 
-import "io"
+import (
+	"fmt"
+	"io"
 
-type Instruction interface {
-	Write(io.ByteWriter)
-	String() string
+	"git.akyoto.dev/cli/q/src/asm/x64"
+	"git.akyoto.dev/cli/q/src/register"
+)
+
+// Instruction represents a single instruction which can be converted to machine code.
+type Instruction struct {
+	Mnemonic    Mnemonic
+	Source      register.ID
+	Destination register.ID
+	Number      uint64
+}
+
+// Write writes the machine code of the instruction.
+func (x *Instruction) Write(w io.ByteWriter) {
+	switch x.Mnemonic {
+	case MOV:
+		x64.MoveRegNum32(w, uint8(x.Destination), uint32(x.Number))
+	case SYSCALL:
+		x64.Syscall(w)
+	}
+}
+
+func (x *Instruction) String() string {
+	switch x.Mnemonic {
+	case MOV:
+		return fmt.Sprintf("%s %s, %x", x.Mnemonic, x.Destination, x.Number)
+	case SYSCALL:
+		return x.Mnemonic.String()
+	default:
+		return ""
+	}
 }