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src/main/java/net/runelite/deob/deobfuscators/arithmetic/MultiplicationDeobfuscator.java

@@ -0,0 +1,75 @@
+package net.runelite.deob.deobfuscators.arithmetic;
+
+import java.util.List;
+import net.runelite.deob.ClassGroup;
+import net.runelite.deob.Deobfuscator;
+import net.runelite.deob.attributes.code.Instruction;
+import net.runelite.deob.attributes.code.Instructions;
+import net.runelite.deob.attributes.code.instruction.types.PushConstantInstruction;
+import net.runelite.deob.attributes.code.instructions.IMul;
+import net.runelite.deob.attributes.code.instructions.LDC_W;
+import net.runelite.deob.execution.Execution;
+import net.runelite.deob.execution.Frame;
+import net.runelite.deob.execution.InstructionContext;
+import net.runelite.deob.execution.StackContext;
+
+public class MultiplicationDeobfuscator implements Deobfuscator
+{
+	private ClassGroup group;
+	
+	@Override
+	public void run(ClassGroup group)
+	{
+		this.group = group;
+		
+		int i;
+		while ((i = runOnce()) > 0)
+			System.out.println("Simplified " + i + " multiplication");
+	}
+	
+	private int runOnce()
+	{
+		Execution e = new Execution(group);
+		e.populateInitialMethods();
+		e.run();
+		
+		int count = 0;
+		
+		for (Frame frame : e.processedFrames)
+			for (InstructionContext ictx : frame.getInstructions())
+			{
+				if (!(ictx.getInstruction() instanceof IMul))
+					continue;
+					
+				Instructions ins = ictx.getInstruction().getInstructions();
+				List<Instruction> ilist = ins.getInstructions();
+
+				if (!ilist.contains(ictx.getInstruction()))
+					continue; // already done
+				
+				StackContext one = ictx.getPops().get(0);
+				StackContext two = ictx.getPops().get(1);
+				
+				if (one.getPushed().getInstruction() instanceof PushConstantInstruction
+					&& two.getPushed().getInstruction() instanceof PushConstantInstruction)
+				{
+					PushConstantInstruction pci1 = (PushConstantInstruction) one.getPushed().getInstruction(),
+						pci2 = (PushConstantInstruction) two.getPushed().getInstruction();
+					
+					int i1 = (int) pci1.getConstant().getObject(),
+						i2 = (int) pci2.getConstant().getObject();
+					
+					int result = i1 * i2;
+					
+					ictx.removeStack(1);
+					ictx.removeStack(0);
+					
+					ins.replace(ictx.getInstruction(), new LDC_W(ins, new net.runelite.deob.pool.Integer(result)));
+					++count;
+				}
+			}
+		
+		return count;
+	}
+
+}