cache: add switch to interpreter

cache/src/main/java/net/runelite/cache/script/interpreter/InstructionHandlers.java

@@ -37,6 +37,7 @@ import net.runelite.cache.script.interpreter.instructions.Invoke;
 import net.runelite.cache.script.interpreter.instructions.Jump;
 import net.runelite.cache.script.interpreter.instructions.LoadInt;
 import net.runelite.cache.script.interpreter.instructions.Return;
+import net.runelite.cache.script.interpreter.instructions.Switch;
 
 public class InstructionHandlers
 {
@@ -59,6 +60,7 @@ public class InstructionHandlers
 		add(Opcodes.IF_ICMPGE, new If_ICmpGE());
 		add(Opcodes.INVOKE, new Invoke());
 		add(Opcodes.RETURN, new Return());
+		add(Opcodes.SWITCH, new Switch());
 	}
 
 	private static void add(int opcode, InstructionHandler handler)

cache/src/main/java/net/runelite/cache/script/interpreter/instructions/If.java

@@ -42,6 +42,8 @@ public abstract class If extends InstructionHandler
 		StackContext sctx2 = intStack.pop();
 
 		ctx.popsInt(sctx1, sctx2);
+		sctx1.poppedBy(ctx);
+		sctx2.poppedBy(ctx);
 
 		Frame dup = frame.dup();
 		dup.jump(iop);

cache/src/main/java/net/runelite/cache/script/interpreter/instructions/Switch.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.cache.script.interpreter.instructions;
+
+import java.util.Map;
+import net.runelite.cache.definitions.ScriptDefinition;
+import net.runelite.cache.script.interpreter.Frame;
+import net.runelite.cache.script.interpreter.InstructionContext;
+import net.runelite.cache.script.interpreter.InstructionHandler;
+import net.runelite.cache.script.interpreter.ScriptInstruction;
+import net.runelite.cache.script.interpreter.Stack;
+import net.runelite.cache.script.interpreter.StackContext;
+
+public class Switch extends InstructionHandler
+{
+	@Override
+	public void execute(Frame frame, InstructionContext ctx)
+	{
+		Stack intStack = frame.getIntStack();
+		ScriptInstruction scriptInstruction = ctx.getScriptInstruction();
+		ScriptDefinition script = frame.getScript();
+		int switchTableIndex = scriptInstruction.getIop();
+
+		// value -> pc
+		Map<Integer, Integer> switchTable = script.getSwitches()[switchTableIndex];
+
+		// pop value off stack
+		StackContext sctx = intStack.pop();
+		ctx.popsInt(sctx);
+		sctx.poppedBy(ctx);
+
+		// jump to targets
+		for (int target : switchTable.values())
+		{
+			Frame dup = frame.dup();
+			dup.jump(target);
+		}
+	}
+
+}