From c6921fba9df242c2d40f52ac0e207466f26c4caf Mon Sep 17 00:00:00 2001
From: Graham <gpe@openrs2.dev>
Date: Mon, 29 Jul 2019 13:52:30 +0100
Subject: [PATCH] Add InsnNodeUtils

This commit introduces four methods: two for finding the next/previous
AbstractInsnNode that contains a real JVM opcode and two for finding the
next/previous AbstractInsnNode that is virtual (e.g. a label).
---
 .../java/dev/openrs2/asm/InsnNodeUtils.java   | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 asm/src/main/java/dev/openrs2/asm/InsnNodeUtils.java

diff --git a/asm/src/main/java/dev/openrs2/asm/InsnNodeUtils.java b/asm/src/main/java/dev/openrs2/asm/InsnNodeUtils.java
new file mode 100644
index 00000000..7c517a4d
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/InsnNodeUtils.java
@@ -0,0 +1,29 @@
+package dev.openrs2.asm;
+
+import org.objectweb.asm.tree.AbstractInsnNode;
+
+public final class InsnNodeUtils {
+	public static AbstractInsnNode nextReal(AbstractInsnNode insn) {
+		while ((insn = insn.getNext()) != null && insn.getOpcode() == -1);
+		return insn;
+	}
+
+	public static AbstractInsnNode previousReal(AbstractInsnNode insn) {
+		while ((insn = insn.getPrevious()) != null && insn.getOpcode() == -1);
+		return insn;
+	}
+
+	public static AbstractInsnNode nextVirtual(AbstractInsnNode insn) {
+		while ((insn = insn.getNext()) != null && insn.getOpcode() != -1);
+		return insn;
+	}
+
+	public static AbstractInsnNode previousVirtual(AbstractInsnNode insn) {
+		while ((insn = insn.getPrevious()) != null && insn.getOpcode() != -1);
+		return insn;
+	}
+
+	private InsnNodeUtils() {
+		/* empty */
+	}
+}