package asm

// Comment adds a comment at the current position.
func (a *Assembler) Comment(text string) {
	a.Instructions = append(a.Instructions, Instruction{
		Mnemonic: COMMENT,
		Data: &Label{
			Name: text,
		},
	})
}

// Call calls a function whose position is identified by a label.
func (a *Assembler) Call(name string) {
	a.Instructions = append(a.Instructions, Instruction{
		Mnemonic: CALL,
		Data: &Label{
			Name: name,
		},
	})
}

// Return returns back to the caller.
func (a *Assembler) Return() {
	if len(a.Instructions) > 0 {
		lastMnemonic := a.Instructions[len(a.Instructions)-1].Mnemonic

		if lastMnemonic == RETURN || lastMnemonic == JUMP {
			return
		}
	}

	a.Instructions = append(a.Instructions, Instruction{Mnemonic: RETURN})
}

// Syscall executes a kernel function.
func (a *Assembler) Syscall() {
	a.Instructions = append(a.Instructions, Instruction{Mnemonic: SYSCALL})
}