Add Analyzer for creating control flow graphs

deob/src/main/java/dev/openrs2/deob/analysis/ControlFlowAnalyzer.kt

@@ -0,0 +1,29 @@
+package dev.openrs2.deob.analysis
+
+import com.google.common.graph.Graph
+import com.google.common.graph.GraphBuilder
+import org.objectweb.asm.tree.MethodNode
+import org.objectweb.asm.tree.analysis.Analyzer
+import org.objectweb.asm.tree.analysis.BasicInterpreter
+import org.objectweb.asm.tree.analysis.BasicValue
+
+class ControlFlowAnalyzer : Analyzer<BasicValue>(BasicInterpreter()) {
+    private val graph = GraphBuilder
+        .directed()
+        .allowsSelfLoops(true)
+        .immutable<Int>()
+
+    override fun newControlFlowEdge(insnIndex: Int, successorIndex: Int) {
+        graph.putEdge(insnIndex, successorIndex)
+    }
+
+    override fun newControlFlowExceptionEdge(insnIndex: Int, successorIndex: Int): Boolean {
+        graph.putEdge(insnIndex, successorIndex)
+        return true
+    }
+
+    fun createGraph(owner: String, method: MethodNode): Graph<Int> {
+        analyze(owner, method)
+        return graph.build()
+    }
+}