Simplified file structure

src/asm/Instructions.go

@@ -0,0 +1,39 @@
+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})
+}