diff --git a/src/me/topchetoeu/jscript/compilation/CompileTarget.java b/src/me/topchetoeu/jscript/compilation/CompileTarget.java
new file mode 100644
index 0000000..0a207ec
--- /dev/null
+++ b/src/me/topchetoeu/jscript/compilation/CompileTarget.java
@@ -0,0 +1,27 @@
+package me.topchetoeu.jscript.compilation;
+
+import java.util.Map;
+import java.util.Vector;
+
+public class CompileTarget {
+    public final Vector<Instruction> target = new Vector<>();
+    public final Map<Long, Instruction[]> functions;
+
+    public Instruction add(Instruction instr) {
+        target.add(instr);
+        return instr;
+    }
+    public Instruction set(int i, Instruction instr) {
+        return target.set(i, instr);
+    }
+    public Instruction get(int i) {
+        return target.get(i);
+    }
+    public int size() { return target.size(); }
+
+    public Instruction[] array() { return target.toArray(Instruction[]::new); }
+
+    public CompileTarget(Map<Long, Instruction[]> functions) {
+        this.functions = functions;
+    }
+}
diff --git a/src/me/topchetoeu/jscript/compilation/CompoundStatement.java b/src/me/topchetoeu/jscript/compilation/CompoundStatement.java
index 07fc640..c76f6ce 100644
--- a/src/me/topchetoeu/jscript/compilation/CompoundStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/CompoundStatement.java
@@ -1,7 +1,6 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Vector;
 
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.control.ContinueStatement;
@@ -21,7 +20,7 @@ public class CompoundStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var stm : statements) {
             if (stm instanceof FunctionStatement) {
                 int start = target.size();
@@ -42,7 +41,7 @@ public class CompoundStatement extends Statement {
 
     @Override
     public Statement optimize() {
-        var res = new ArrayList<Statement>();
+        var res = new Vector<Statement>(statements.length);
 
         for (var i = 0; i < statements.length; i++) {
             var stm = statements[i].optimize();
diff --git a/src/me/topchetoeu/jscript/compilation/DiscardStatement.java b/src/me/topchetoeu/jscript/compilation/DiscardStatement.java
index 67ad9f8..6e54b4c 100644
--- a/src/me/topchetoeu/jscript/compilation/DiscardStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/DiscardStatement.java
@@ -1,7 +1,5 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.values.ConstantStatement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -10,7 +8,7 @@ public class DiscardStatement extends Statement {
     public final Statement value;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         value.compile(target, scope, false);
         
     }
diff --git a/src/me/topchetoeu/jscript/compilation/Instruction.java b/src/me/topchetoeu/jscript/compilation/Instruction.java
index bc588d8..4e3efe5 100644
--- a/src/me/topchetoeu/jscript/compilation/Instruction.java
+++ b/src/me/topchetoeu/jscript/compilation/Instruction.java
@@ -214,9 +214,9 @@ public class Instruction {
     public static Instruction loadRegex(String pattern, String flags) {
         return new Instruction(null, Type.LOAD_REGEX, pattern, flags);
     }
-    public static Instruction loadFunc(int instrN, int varN, int len, int[] captures) {
+    public static Instruction loadFunc(long id, int varN, int len, int[] captures) {
         var args = new Object[3 + captures.length];
-        args[0] = instrN;
+        args[0] = id;
         args[1] = varN;
         args[2] = len;
         for (var i = 0; i < captures.length; i++) args[i + 3] = captures[i];
diff --git a/src/me/topchetoeu/jscript/compilation/Statement.java b/src/me/topchetoeu/jscript/compilation/Statement.java
index 88d9644..7b51b38 100644
--- a/src/me/topchetoeu/jscript/compilation/Statement.java
+++ b/src/me/topchetoeu/jscript/compilation/Statement.java
@@ -1,7 +1,5 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
@@ -9,11 +7,11 @@ public abstract class Statement {
     private Location _loc;
 
     public boolean pure() { return false; }
-    public abstract void compile(List<Instruction> target, ScopeRecord scope, boolean pollute);
+    public abstract void compile(CompileTarget target, ScopeRecord scope, boolean pollute);
     public void declare(ScopeRecord varsScope) { }
     public Statement optimize() { return this; }
 
-    public void compileWithDebug(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compileWithDebug(CompileTarget target, ScopeRecord scope, boolean pollute) {
         int start = target.size();
         compile(target, scope, pollute);
         if (target.size() != start) target.get(start).setDebug(true);
diff --git a/src/me/topchetoeu/jscript/compilation/VariableDeclareStatement.java b/src/me/topchetoeu/jscript/compilation/VariableDeclareStatement.java
index ca91393..667a982 100644
--- a/src/me/topchetoeu/jscript/compilation/VariableDeclareStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/VariableDeclareStatement.java
@@ -26,7 +26,7 @@ public class VariableDeclareStatement extends Statement {
         }
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var entry : values) {
             if (entry.name == null) continue;
             var key = scope.getKey(entry.name);
diff --git a/src/me/topchetoeu/jscript/compilation/control/ArrayStatement.java b/src/me/topchetoeu/jscript/compilation/control/ArrayStatement.java
index 7c4f1ce..e819baa 100644
--- a/src/me/topchetoeu/jscript/compilation/control/ArrayStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/ArrayStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -14,7 +13,7 @@ public class ArrayStatement extends Statement {
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadArr(statements.length).locate(loc()));
         var i = 0;
         for (var el : statements) {
diff --git a/src/me/topchetoeu/jscript/compilation/control/BreakStatement.java b/src/me/topchetoeu/jscript/compilation/control/BreakStatement.java
index 7e84fac..88be1ab 100644
--- a/src/me/topchetoeu/jscript/compilation/control/BreakStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/BreakStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,7 +10,7 @@ public class BreakStatement extends Statement {
     public final String label;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop("break", label).locate(loc()));
         if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/control/ContinueStatement.java b/src/me/topchetoeu/jscript/compilation/control/ContinueStatement.java
index a0c8b6b..6828502 100644
--- a/src/me/topchetoeu/jscript/compilation/control/ContinueStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/ContinueStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,7 +10,7 @@ public class ContinueStatement extends Statement {
     public final String label;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop("cont", label).locate(loc()));
         if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/control/DebugStatement.java b/src/me/topchetoeu/jscript/compilation/control/DebugStatement.java
index 3edb6c0..f98a434 100644
--- a/src/me/topchetoeu/jscript/compilation/control/DebugStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/DebugStatement.java
@@ -1,15 +1,14 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
 public class DebugStatement extends Statement {
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.debug().locate(loc()));
         if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/control/DeleteStatement.java b/src/me/topchetoeu/jscript/compilation/control/DeleteStatement.java
index 9907524..526ff74 100644
--- a/src/me/topchetoeu/jscript/compilation/control/DeleteStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/DeleteStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,7 +11,7 @@ public class DeleteStatement extends Statement {
     public final Statement value;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         value.compile(target, scope, true);
         key.compile(target, scope, true);
 
diff --git a/src/me/topchetoeu/jscript/compilation/control/DoWhileStatement.java b/src/me/topchetoeu/jscript/compilation/control/DoWhileStatement.java
index 49621d5..41f9dfe 100644
--- a/src/me/topchetoeu/jscript/compilation/control/DoWhileStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/DoWhileStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
@@ -20,7 +19,7 @@ public class DoWhileStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             int start = target.size();
             body.compile(target, scope, false);
diff --git a/src/me/topchetoeu/jscript/compilation/control/ForInStatement.java b/src/me/topchetoeu/jscript/compilation/control/ForInStatement.java
index fb82218..7ce5d6d 100644
--- a/src/me/topchetoeu/jscript/compilation/control/ForInStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/ForInStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -21,7 +20,7 @@ public class ForInStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var key = scope.getKey(varName);
         if (key instanceof String) target.add(Instruction.makeVar((String)key));
 
diff --git a/src/me/topchetoeu/jscript/compilation/control/ForStatement.java b/src/me/topchetoeu/jscript/compilation/control/ForStatement.java
index e135a74..726e05e 100644
--- a/src/me/topchetoeu/jscript/compilation/control/ForStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/ForStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.values.ConstantStatement;
@@ -20,7 +19,7 @@ public class ForStatement extends Statement {
         body.declare(globScope);
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         declaration.compile(target, scope, false);
 
         if (condition instanceof ConstantStatement) {
diff --git a/src/me/topchetoeu/jscript/compilation/control/IfStatement.java b/src/me/topchetoeu/jscript/compilation/control/IfStatement.java
index 1f2921b..96c94ac 100644
--- a/src/me/topchetoeu/jscript/compilation/control/IfStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/IfStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.DiscardStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
@@ -21,7 +20,7 @@ public class IfStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)condition).value)) {
                 if (elseBody != null) elseBody.compileWithDebug(target, scope, pollute);
diff --git a/src/me/topchetoeu/jscript/compilation/control/ReturnStatement.java b/src/me/topchetoeu/jscript/compilation/control/ReturnStatement.java
index 8d10211..896f33c 100644
--- a/src/me/topchetoeu/jscript/compilation/control/ReturnStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/ReturnStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,7 +10,7 @@ public class ReturnStatement extends Statement {
     public final Statement value;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value == null) target.add(Instruction.loadValue(null).locate(loc()));
         else value.compile(target, scope, true);
         target.add(Instruction.ret().locate(loc()));
diff --git a/src/me/topchetoeu/jscript/compilation/control/SwitchStatement.java b/src/me/topchetoeu/jscript/compilation/control/SwitchStatement.java
index a9b0993..5ed0a1d 100644
--- a/src/me/topchetoeu/jscript/compilation/control/SwitchStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/SwitchStatement.java
@@ -1,9 +1,9 @@
 package me.topchetoeu.jscript.compilation.control;
 
 import java.util.HashMap;
-import java.util.List;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.Instruction.Type;
@@ -32,7 +32,7 @@ public class SwitchStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var caseMap = new HashMap<Integer, Integer>();
         var stmIndexMap = new HashMap<Integer, Integer>();
 
diff --git a/src/me/topchetoeu/jscript/compilation/control/ThrowStatement.java b/src/me/topchetoeu/jscript/compilation/control/ThrowStatement.java
index ea68d47..cf424ad 100644
--- a/src/me/topchetoeu/jscript/compilation/control/ThrowStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/ThrowStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -11,7 +10,7 @@ public class ThrowStatement extends Statement {
     public final Statement value;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         value.compile(target, scope, true);
         target.add(Instruction.throwInstr().locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/control/TryStatement.java b/src/me/topchetoeu/jscript/compilation/control/TryStatement.java
index f25fdf2..1855f1b 100644
--- a/src/me/topchetoeu/jscript/compilation/control/TryStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/TryStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.GlobalScope;
@@ -23,7 +22,7 @@ public class TryStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.nop());
 
         int start = target.size(), tryN, catchN = -1, finN = -1;
diff --git a/src/me/topchetoeu/jscript/compilation/control/WhileStatement.java b/src/me/topchetoeu/jscript/compilation/control/WhileStatement.java
index 84dbde8..68a9e1b 100644
--- a/src/me/topchetoeu/jscript/compilation/control/WhileStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/control/WhileStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.control;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.DiscardStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
@@ -21,7 +20,7 @@ public class WhileStatement extends Statement {
         body.declare(globScope);
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (condition instanceof ConstantStatement) {
             if (Values.toBoolean(((ConstantStatement)condition).value)) {
                 int start = target.size();
@@ -68,7 +67,7 @@ public class WhileStatement extends Statement {
         this.body = body;
     }
 
-    public static void replaceBreaks(List<Instruction> target, String label, int start, int end, int continuePoint, int breakPoint) {
+    public static void replaceBreaks(CompileTarget target, String label, int start, int end, int continuePoint, int breakPoint) {
         for (int i = start; i < end; i++) {
             var instr = target.get(i);
             if (instr.type == Type.NOP && instr.is(0, "cont") && (instr.get(1) == null || instr.is(1, label))) {
diff --git a/src/me/topchetoeu/jscript/compilation/values/CallStatement.java b/src/me/topchetoeu/jscript/compilation/values/CallStatement.java
index 8908179..b63a93d 100644
--- a/src/me/topchetoeu/jscript/compilation/values/CallStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/CallStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,7 +11,7 @@ public class CallStatement extends Statement {
     public final Statement[] args;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (func instanceof IndexStatement) {
             ((IndexStatement)func).compile(target, scope, true, true);
         }
diff --git a/src/me/topchetoeu/jscript/compilation/values/ChangeStatement.java b/src/me/topchetoeu/jscript/compilation/values/ChangeStatement.java
index 0d97f15..4642c40 100644
--- a/src/me/topchetoeu/jscript/compilation/values/ChangeStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/ChangeStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -15,7 +14,7 @@ public class ChangeStatement extends Statement {
     public final boolean postfix;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         value.toAssign(new ConstantStatement(loc(), -addAmount), Operation.SUBTRACT).compile(target, scope, postfix);
         if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/values/ConstantStatement.java b/src/me/topchetoeu/jscript/compilation/values/ConstantStatement.java
index 563175b..f0458ae 100644
--- a/src/me/topchetoeu/jscript/compilation/values/ConstantStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/ConstantStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -14,7 +13,7 @@ public class ConstantStatement extends Statement {
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (pollute) target.add(Instruction.loadValue(value).locate(loc()));
     }
 
diff --git a/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java b/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java
index 60cb65b..ca11b27 100644
--- a/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/FunctionStatement.java
@@ -1,8 +1,9 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
+import java.util.Random;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.CompoundStatement;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
@@ -15,6 +16,8 @@ public class FunctionStatement extends Statement {
     public final String name;
     public final String[] args;
 
+    private static Random rand = new Random();
+
     @Override
     public boolean pure() { return name == null; }
 
@@ -23,7 +26,7 @@ public class FunctionStatement extends Statement {
         if (name != null) scope.define(name);
     }
 
-    public static void checkBreakAndCont(List<Instruction> target, int start) {
+    public static void checkBreakAndCont(CompileTarget target, int start) {
         for (int i = start; i < target.size(); i++) {
             if (target.get(i).type == Type.NOP) {
                 if (target.get(i).is(0, "break") ) {
@@ -36,7 +39,7 @@ public class FunctionStatement extends Statement {
         }
     }
 
-    public void compile(List<Instruction> target, ScopeRecord scope, String name, boolean isStatement) {
+    public void compile(CompileTarget target, ScopeRecord scope, String name, boolean isStatement) {
         for (var i = 0; i < args.length; i++) {
             for (var j = 0; j < i; j++) {
                 if (args[i].equals(args[j])){
@@ -48,32 +51,33 @@ public class FunctionStatement extends Statement {
         var subscope = scope.child();
 
         int start = target.size();
+        var funcTarget = new CompileTarget(target.functions);
 
-        target.add(Instruction.nop());
         subscope.define("this");
         var argsVar = subscope.define("arguments");
 
         if (args.length > 0) {
             for (var i = 0; i < args.length; i++) {
-                target.add(Instruction.loadVar(argsVar).locate(loc()));
-                target.add(Instruction.loadMember(i).locate(loc()));
-                target.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
+                funcTarget.add(Instruction.loadVar(argsVar).locate(loc()));
+                funcTarget.add(Instruction.loadMember(i).locate(loc()));
+                funcTarget.add(Instruction.storeVar(subscope.define(args[i])).locate(loc()));
             }
         }
 
         if (!isStatement && this.name != null) {
-            target.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
+            funcTarget.add(Instruction.storeSelfFunc((int)subscope.define(this.name)));
         }
 
         body.declare(subscope);
-        target.add(Instruction.debugVarNames(subscope.locals()));
-        body.compile(target, subscope, false);
+        funcTarget.add(Instruction.debugVarNames(subscope.locals()));
+        body.compile(funcTarget, subscope, false);
+        funcTarget.add(Instruction.ret().locate(loc()));
+        checkBreakAndCont(funcTarget, start);
 
-        checkBreakAndCont(target, start);
+        var id = rand.nextLong();
 
-        if (!(body instanceof CompoundStatement)) target.add(Instruction.ret().locate(loc()));
-
-        target.set(start, Instruction.loadFunc(target.size() - start, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
+        target.add(Instruction.loadFunc(id, subscope.localsCount(), args.length, subscope.getCaptures()).locate(loc()));
+        target.functions.put(id, funcTarget.array());
 
         if (name == null) name = this.name;
 
@@ -90,9 +94,10 @@ public class FunctionStatement extends Statement {
             if (key instanceof String) target.add(Instruction.makeVar((String)key).locate(loc()));
             target.add(Instruction.storeVar(scope.getKey(this.name), false).locate(loc()));
         }
+
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         compile(target, scope, null, false);
         if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/values/GlobalThisStatement.java b/src/me/topchetoeu/jscript/compilation/values/GlobalThisStatement.java
index 0b8479c..354d09d 100644
--- a/src/me/topchetoeu/jscript/compilation/values/GlobalThisStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/GlobalThisStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
@@ -12,7 +11,7 @@ public class GlobalThisStatement extends Statement {
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (pollute) target.add(Instruction.loadGlob().locate(loc()));
     }
 
diff --git a/src/me/topchetoeu/jscript/compilation/values/IndexAssignStatement.java b/src/me/topchetoeu/jscript/compilation/values/IndexAssignStatement.java
index b14b70f..55a99cd 100644
--- a/src/me/topchetoeu/jscript/compilation/values/IndexAssignStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/IndexAssignStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -15,7 +14,7 @@ public class IndexAssignStatement extends Statement {
     public final Operation operation;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (operation != null) {
             object.compile(target, scope, true);
             index.compile(target, scope, true);
diff --git a/src/me/topchetoeu/jscript/compilation/values/IndexStatement.java b/src/me/topchetoeu/jscript/compilation/values/IndexStatement.java
index ff913aa..6159f4f 100644
--- a/src/me/topchetoeu/jscript/compilation/values/IndexStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/IndexStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -20,7 +19,7 @@ public class IndexStatement extends AssignableStatement {
     public Statement toAssign(Statement val, Operation operation) {
         return new IndexAssignStatement(loc(), object, index, val, operation);
     }
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean dupObj, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean dupObj, boolean pollute) {
         int start = 0;
         object.compile(target, scope, true);
         if (dupObj) target.add(Instruction.dup().locate(loc()));
@@ -35,7 +34,7 @@ public class IndexStatement extends AssignableStatement {
         if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         compile(target, scope, false, pollute);
     }
 
diff --git a/src/me/topchetoeu/jscript/compilation/values/LazyAndStatement.java b/src/me/topchetoeu/jscript/compilation/values/LazyAndStatement.java
index 0517dcf..d71ab81 100644
--- a/src/me/topchetoeu/jscript/compilation/values/LazyAndStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/LazyAndStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -17,7 +16,7 @@ public class LazyAndStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (first instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)first).value)) {
                 first.compile(target, scope, pollute);
diff --git a/src/me/topchetoeu/jscript/compilation/values/LazyOrStatement.java b/src/me/topchetoeu/jscript/compilation/values/LazyOrStatement.java
index d601429..476a546 100644
--- a/src/me/topchetoeu/jscript/compilation/values/LazyOrStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/LazyOrStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -17,7 +16,7 @@ public class LazyOrStatement extends Statement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (first instanceof ConstantStatement) {
             if (Values.not(((ConstantStatement)first).value)) {
                 second.compile(target, scope, pollute);
diff --git a/src/me/topchetoeu/jscript/compilation/values/NewStatement.java b/src/me/topchetoeu/jscript/compilation/values/NewStatement.java
index 4f50098..dbb632c 100644
--- a/src/me/topchetoeu/jscript/compilation/values/NewStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/NewStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -12,7 +11,7 @@ public class NewStatement extends Statement {
     public final Statement[] args;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         func.compile(target, scope, true);
 
         for (var arg : args) arg.compile(target, scope, true);
diff --git a/src/me/topchetoeu/jscript/compilation/values/ObjectStatement.java b/src/me/topchetoeu/jscript/compilation/values/ObjectStatement.java
index 7a2e9cc..abcec8d 100644
--- a/src/me/topchetoeu/jscript/compilation/values/ObjectStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/ObjectStatement.java
@@ -1,10 +1,10 @@
 package me.topchetoeu.jscript.compilation.values;
 
 import java.util.ArrayList;
-import java.util.List;
 import java.util.Map;
 
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -15,7 +15,7 @@ public class ObjectStatement extends Statement {
     public final Map<Object, FunctionStatement> setters;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadObj().locate(loc()));
 
         for (var el : map.entrySet()) {
diff --git a/src/me/topchetoeu/jscript/compilation/values/OperationStatement.java b/src/me/topchetoeu/jscript/compilation/values/OperationStatement.java
index 96d12ab..3016ee2 100644
--- a/src/me/topchetoeu/jscript/compilation/values/OperationStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/OperationStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.control.ThrowStatement;
@@ -16,7 +15,7 @@ public class OperationStatement extends Statement {
     public final Operation operation;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         for (var arg : args) {
             arg.compile(target, scope, true);
         }
diff --git a/src/me/topchetoeu/jscript/compilation/values/RegexStatement.java b/src/me/topchetoeu/jscript/compilation/values/RegexStatement.java
index 162c71c..26f83b4 100644
--- a/src/me/topchetoeu/jscript/compilation/values/RegexStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/RegexStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -14,7 +13,7 @@ public class RegexStatement extends Statement {
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         target.add(Instruction.loadRegex(pattern, flags).locate(loc()));
         if (!pollute) target.add(Instruction.discard().locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/compilation/values/TypeofStatement.java b/src/me/topchetoeu/jscript/compilation/values/TypeofStatement.java
index 50a0183..41eb2a1 100644
--- a/src/me/topchetoeu/jscript/compilation/values/TypeofStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/TypeofStatement.java
@@ -1,8 +1,7 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.compilation.control.ArrayStatement;
@@ -16,7 +15,7 @@ public class TypeofStatement extends Statement {
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value instanceof VariableStatement) {
             var i = scope.getKey(((VariableStatement)value).name);
             if (i instanceof String) {
diff --git a/src/me/topchetoeu/jscript/compilation/values/VariableAssignStatement.java b/src/me/topchetoeu/jscript/compilation/values/VariableAssignStatement.java
index 749f939..2644233 100644
--- a/src/me/topchetoeu/jscript/compilation/values/VariableAssignStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/VariableAssignStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.Operation;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
@@ -14,7 +13,7 @@ public class VariableAssignStatement extends Statement {
     public final Operation operation;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var i = scope.getKey(name);
         if (operation != null) {
             target.add(Instruction.loadVar(i).locate(loc()));
diff --git a/src/me/topchetoeu/jscript/compilation/values/VariableIndexStatement.java b/src/me/topchetoeu/jscript/compilation/values/VariableIndexStatement.java
index e02a5fd..a916407 100644
--- a/src/me/topchetoeu/jscript/compilation/values/VariableIndexStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/VariableIndexStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
 
@@ -14,7 +13,7 @@ public class VariableIndexStatement extends Statement {
     public boolean pure() { return true; }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (pollute) target.add(Instruction.loadVar(index).locate(loc()));
     }
 
diff --git a/src/me/topchetoeu/jscript/compilation/values/VariableStatement.java b/src/me/topchetoeu/jscript/compilation/values/VariableStatement.java
index 1059014..947d029 100644
--- a/src/me/topchetoeu/jscript/compilation/values/VariableStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/VariableStatement.java
@@ -1,9 +1,8 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.AssignableStatement;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.Operation;
@@ -21,7 +20,7 @@ public class VariableStatement extends AssignableStatement {
     }
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         var i = scope.getKey(name);
         target.add(Instruction.loadVar(i).locate(loc()));
         if (!pollute) target.add(Instruction.discard().locate(loc()));
diff --git a/src/me/topchetoeu/jscript/compilation/values/VoidStatement.java b/src/me/topchetoeu/jscript/compilation/values/VoidStatement.java
index 21b5bb2..fbf0b63 100644
--- a/src/me/topchetoeu/jscript/compilation/values/VoidStatement.java
+++ b/src/me/topchetoeu/jscript/compilation/values/VoidStatement.java
@@ -1,17 +1,16 @@
 package me.topchetoeu.jscript.compilation.values;
 
-import java.util.List;
-
 import me.topchetoeu.jscript.Location;
 import me.topchetoeu.jscript.compilation.Statement;
 import me.topchetoeu.jscript.engine.scope.ScopeRecord;
+import me.topchetoeu.jscript.compilation.CompileTarget;
 import me.topchetoeu.jscript.compilation.Instruction;
 
 public class VoidStatement extends Statement {
     public final Statement value;
 
     @Override
-    public void compile(List<Instruction> target, ScopeRecord scope, boolean pollute) {
+    public void compile(CompileTarget target, ScopeRecord scope, boolean pollute) {
         if (value != null) value.compile(target, scope, false);
         if (pollute) target.add(Instruction.loadValue(null).locate(loc()));
     }
diff --git a/src/me/topchetoeu/jscript/engine/Context.java b/src/me/topchetoeu/jscript/engine/Context.java
index 882e7ce..480453f 100644
--- a/src/me/topchetoeu/jscript/engine/Context.java
+++ b/src/me/topchetoeu/jscript/engine/Context.java
@@ -10,7 +10,7 @@ public class Context {
 
     public FunctionValue compile(String filename, String raw) throws InterruptedException {
         var res = Values.toString(this, env.compile.call(this, null, raw, filename));
-        return Parsing.compile(env, filename, res);
+        return Parsing.compile(message.engine.functions, env, filename, res);
     }
 
     public Context setEnv(Environment env) {
diff --git a/src/me/topchetoeu/jscript/engine/Engine.java b/src/me/topchetoeu/jscript/engine/Engine.java
index 013b66e..ae4b3a7 100644
--- a/src/me/topchetoeu/jscript/engine/Engine.java
+++ b/src/me/topchetoeu/jscript/engine/Engine.java
@@ -1,7 +1,9 @@
 package me.topchetoeu.jscript.engine;
 
+import java.util.HashMap;
 import java.util.concurrent.LinkedBlockingDeque;
 
+import me.topchetoeu.jscript.compilation.Instruction;
 import me.topchetoeu.jscript.engine.values.FunctionValue;
 import me.topchetoeu.jscript.events.Awaitable;
 import me.topchetoeu.jscript.events.DataNotifier;
@@ -49,6 +51,7 @@ public class Engine {
     private LinkedBlockingDeque<Task> microTasks = new LinkedBlockingDeque<>();
 
     public final int id = ++nextId;
+    public final HashMap<Long, Instruction[]> functions = new HashMap<>();
 
     private void runTask(Task task) throws InterruptedException {
         try {
diff --git a/src/me/topchetoeu/jscript/engine/frame/Runners.java b/src/me/topchetoeu/jscript/engine/frame/Runners.java
index 2869eda..ba56ad2 100644
--- a/src/me/topchetoeu/jscript/engine/frame/Runners.java
+++ b/src/me/topchetoeu/jscript/engine/frame/Runners.java
@@ -182,7 +182,7 @@ public class Runners {
         return NO_RETURN;
     }
     public static Object execLoadFunc(Context ctx, Instruction instr, CodeFrame frame) {
-        int n = (Integer)instr.get(0);
+        long id = (Long)instr.get(0);
         int localsN = (Integer)instr.get(1);
         int len = (Integer)instr.get(2);
         var captures = new ValueVariable[instr.params.length - 3];
@@ -191,15 +191,12 @@ public class Runners {
             captures[i - 3] = frame.scope.get(instr.get(i));
         }
 
-        var start = frame.codePtr + 1;
-        var end = start + n - 1;
-        var body = new Instruction[end - start];
-        System.arraycopy(frame.function.body, start, body, 0, end - start);
-
+        var body = ctx.message.engine.functions.get(id);
         var func = new CodeFunction(ctx.env, "", localsN, len, captures, body);
+
         frame.push(ctx, func);
 
-        frame.codePtr += n;
+        frame.codePtr++;
         return NO_RETURN;
     }
     public static Object execLoadMember(Context ctx, Instruction instr, CodeFrame frame) throws InterruptedException {
diff --git a/src/me/topchetoeu/jscript/parsing/Parsing.java b/src/me/topchetoeu/jscript/parsing/Parsing.java
index 5962f42..aa74e01 100644
--- a/src/me/topchetoeu/jscript/parsing/Parsing.java
+++ b/src/me/topchetoeu/jscript/parsing/Parsing.java
@@ -2,6 +2,7 @@ package me.topchetoeu.jscript.parsing;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -39,6 +40,8 @@ public class Parsing {
         }
     }
 
+    public static final HashMap<Long, ArrayList<Instruction>> functions = new HashMap<>();
+
     private static final HashSet<String> reserved = new HashSet<String>();
     static {
         reserved.add("true");
@@ -1871,12 +1874,11 @@ public class Parsing {
         return list.toArray(Statement[]::new);
     }
 
-    public static CodeFunction compile(Environment environment, Statement ...statements) {
+    public static CodeFunction compile(HashMap<Long, Instruction[]> funcs, Environment environment, Statement ...statements) {
         var target = environment.global.globalChild();
         var subscope = target.child();
-        var res = new ArrayList<Instruction>();
+        var res = new CompileTarget(funcs);
         var body = new CompoundStatement(null, statements);
-        // var optimized = body.optimize();
         if (body instanceof CompoundStatement) body = (CompoundStatement)body;
         else body = new CompoundStatement(null, new Statement[] { body });
 
@@ -1890,7 +1892,7 @@ public class Parsing {
             FunctionStatement.checkBreakAndCont(res, 0);
         }
         catch (SyntaxException e) {
-            res.clear();
+            res.target.clear();
             res.add(Instruction.throwSyntax(e));
         }
 
@@ -1899,11 +1901,11 @@ public class Parsing {
         }
         else res.add(Instruction.ret());
 
-        return new CodeFunction(environment, "", subscope.localsCount(), 0, new ValueVariable[0], res.toArray(Instruction[]::new));
+        return new CodeFunction(environment, "", subscope.localsCount(), 0, new ValueVariable[0], res.array());
     }
-    public static CodeFunction compile(Environment environment, String filename, String raw) {
+    public static CodeFunction compile(HashMap<Long, Instruction[]> funcs, Environment environment, String filename, String raw) {
         try {
-            return compile(environment, parse(filename, raw));
+            return compile(funcs, environment, parse(filename, raw));
         }
         catch (SyntaxException e) {
             return new CodeFunction(environment, null, 2, 0, new ValueVariable[0], new Instruction[] { Instruction.throwSyntax(e) });