Implemented data labels

src/build/asm/RegisterLabel.go

@@ -0,0 +1,29 @@
+package asm
+
+import (
+	"fmt"
+
+	"git.akyoto.dev/cli/q/src/build/cpu"
+)
+
+// RegisterLabel operates with a register and a label.
+type RegisterLabel struct {
+	Register cpu.Register
+	Label    string
+}
+
+// String returns a human readable version.
+func (data *RegisterLabel) String() string {
+	return fmt.Sprintf("%s, %s", data.Register, data.Label)
+}
+
+// RegisterLabel adds an instruction with a register and a label.
+func (a *Assembler) RegisterLabel(mnemonic Mnemonic, reg cpu.Register, label string) {
+	a.Instructions = append(a.Instructions, Instruction{
+		Mnemonic: mnemonic,
+		Data: &RegisterLabel{
+			Register: reg,
+			Label:    label,
+		},
+	})
+}