diff --git a/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala
index 97693c473..22381ec3e 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/CSharpCompiler.scala
@@ -220,7 +220,7 @@ class CSharpCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(varName: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val privateVarName = privateMemberName(varName)
 
     val ioName = s"io_$privateVarName"
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala
index b0fdee657..dde8f9bf5 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/CppCompiler.scala
@@ -478,7 +478,7 @@ class CppCompiler(
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(id: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val memberName = privateMemberName(id)
     val ioId = IoStorageIdentifier(id)
 
@@ -855,7 +855,7 @@ class CppCompiler(
 
   override def instanceCalculate(instName: Identifier, dataType: DataType, value: Ast.expr): Unit = {
     if (attrDebugNeeded(instName))
-      attrDebugStart(instName, dataType, None, NoRepeat)
+      attrDebugStart(instName, dataType, NoRepeat, None, NoRepeat)
     val valExpr = expression(value)
     val isOwningInExpr = dataType match {
       case ct: ComplexDataType => ct.isOwningInExpr
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
index 49e4343e1..9ca533710 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
@@ -238,7 +238,7 @@ class GoCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, ResultString(expr), rep, false)
   }
 
-  override def allocateIO(varName: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val javaName = privateMemberName(varName)
 
     val ioName = idToStr(IoStorageIdentifier(varName))
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
index ee19058d3..524255080 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/JavaCompiler.scala
@@ -72,16 +72,23 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
       ""
     }
 
-    out.puts(s"public ${staticStr}class ${type2class(name)} extends $kstructName {")
+    val iface = if (config.readStoresPos) {
+      "implements PositionInfo "
+    } else {
+      ""
+    }
+
+    out.puts(s"public ${staticStr}class ${type2class(name)} extends $kstructName $iface{")
     out.inc
 
     if (config.readStoresPos) {
-      out.puts("public Map<String, Integer> _attrStart = new HashMap<String, Integer>();")
-      out.puts("public Map<String, Integer> _attrEnd = new HashMap<String, Integer>();")
-      out.puts("public Map<String, ArrayList<Integer>> _arrStart = new HashMap<String, ArrayList<Integer>>();")
-      out.puts("public Map<String, ArrayList<Integer>> _arrEnd = new HashMap<String, ArrayList<Integer>>();")
+      out.puts("public final Map<String, Span> _spans = new HashMap<String, Span>();")
+      out.puts("@Override")
+      out.puts("public final Map<String, Span> _spans() { return this._spans; }")
       out.puts
 
+      importList.add("io.kaitai.struct.PositionInfo")
+      importList.add("io.kaitai.struct.Span")
       importList.add("java.util.ArrayList")
       importList.add("java.util.HashMap")
       importList.add("java.util.Map")
@@ -221,6 +228,14 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     out.puts( " */")
   }
 
+  override def attrParse(attr: AttrLikeSpec, id: Identifier, defEndian: Option[Endianness]): Unit = {
+    out.puts(s"{// ${idToStr(id)}")
+    out.inc
+    super.attrParse(attr, id, defEndian)
+    out.dec
+    out.puts("}")
+  }
+
   override def attrParseHybrid(leProc: () => Unit, beProc: () => Unit): Unit = {
     out.puts("if (_is_le) {")
     out.inc
@@ -268,7 +283,7 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(varName: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val ioName = idToStr(IoStorageIdentifier(varName))
 
     val args = rep match {
@@ -277,7 +292,7 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     }
 
     importList.add("io.kaitai.struct.ByteBufferKaitaiStream")
-    out.puts(s"$kstreamName $ioName = new ByteBufferKaitaiStream($args);")
+    out.puts(s"$kstreamName $ioName = new ByteBufferKaitaiStream($args, $currentIo.offset());")
     ioName
   }
 
@@ -306,14 +321,23 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def alignToByte(io: String): Unit =
     out.puts(s"$io.alignToByte();")
 
-  override def attrDebugStart(attrId: Identifier, attrType: DataType, ios: Option[String], rep: RepeatSpec): Unit = {
+  override def attrDebugStart(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, ios: Option[String], rep: RepeatSpec): Unit = {
     ios.foreach { (io) =>
       val name = idToStr(attrId)
       rep match {
         case NoRepeat =>
-          out.puts("_attrStart.put(\"" + name + "\", " + io + ".pos());")
+          attrRep match {
+            case NoRepeat =>
+              out.puts(s"final Span _s = new Span(${io});")
+              out.puts(s"""this._spans.put("${name}", _s);""")
+              importList.add("io.kaitai.struct.Span")
+            case _: RepeatExpr | RepeatEos | _: RepeatUntil =>
+              out.puts(s"final ArraySpan _as = new ArraySpan(${io});")
+              out.puts(s"""this._spans.put("${name}", _as);""")
+              importList.add("io.kaitai.struct.ArraySpan")
+          }
         case _: RepeatExpr | RepeatEos | _: RepeatUntil =>
-          getOrCreatePosList("_arrStart", name, io)
+          out.puts(s"final Span _is = _as.addItem(${io});")
       }
     }
   }
@@ -322,31 +346,21 @@ class JavaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     // no _debug[$name]['arr'] initialization needed in Java
   }
 
-  override def attrDebugEnd(attrId: Identifier, attrType: DataType, io: String, rep: RepeatSpec): Unit = {
+  override def attrDebugEnd(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, io: String, rep: RepeatSpec): Unit = {
     val name = idToStr(attrId)
     rep match {
       case NoRepeat =>
-        out.puts("_attrEnd.put(\"" + name + "\", " + io + ".pos());")
+        attrRep match {
+          case NoRepeat =>
+            out.puts(s"_s.end = ${io}.pos();")
+          case _: RepeatExpr | RepeatEos | _: RepeatUntil =>
+            out.puts(s"_as.end = ${io}.pos();")
+        }
       case _: RepeatExpr | RepeatEos | _: RepeatUntil =>
-        getOrCreatePosList("_arrEnd", name, io)
+        out.puts(s"_is.end = ${io}.pos();")
     }
   }
 
-  def getOrCreatePosList(listName: String, varName: String, io: String): Unit = {
-    out.puts("{")
-    out.inc
-    out.puts("ArrayList<Integer> _posList = " + listName + ".get(\"" + varName + "\");")
-    out.puts("if (_posList == null) {")
-    out.inc
-    out.puts("_posList = new ArrayList<Integer>();")
-    out.puts(listName + ".put(\"" + varName + "\", _posList);")
-    out.dec
-    out.puts("}")
-    out.puts(s"_posList.add($io.pos());")
-    out.dec
-    out.puts("}")
-  }
-
   override def condIfHeader(expr: expr): Unit = {
     out.puts(s"if (${expression(expr)}) {")
     out.inc
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/JavaScriptCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/JavaScriptCompiler.scala
index a039b4560..cf298c47e 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/JavaScriptCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/JavaScriptCompiler.scala
@@ -226,7 +226,7 @@ class JavaScriptCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(varName: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val langName = idToStr(varName)
     val memberCall = privateMemberName(varName)
 
@@ -264,7 +264,7 @@ class JavaScriptCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def alignToByte(io: String): Unit =
     out.puts(s"$io.alignToByte();")
 
-  override def attrDebugStart(attrId: Identifier, attrType: DataType, io: Option[String], rep: RepeatSpec): Unit = {
+  override def attrDebugStart(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, io: Option[String], rep: RepeatSpec): Unit = {
     val debugName = attrDebugName(attrId, rep, false)
 
     val ioProps = io match {
@@ -283,7 +283,7 @@ class JavaScriptCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def attrDebugArrInit(id: Identifier, attrType: DataType): Unit =
     out.puts(s"this._debug.${idToStr(id)}.arr = [];")
 
-  override def attrDebugEnd(attrId: Identifier, attrType: DataType, io: String, rep: RepeatSpec): Unit = {
+  override def attrDebugEnd(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, io: String, rep: RepeatSpec): Unit = {
     val debugName = attrDebugName(attrId, rep, true)
 
     out.puts(s"$debugName.end = $io.pos;")
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/LuaCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/LuaCompiler.scala
index 1f24674e9..777e33cb3 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/LuaCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/LuaCompiler.scala
@@ -408,7 +408,7 @@ class LuaCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def switchIfEnd(): Unit =
     out.puts("end")
 
-  override def allocateIO(varName: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val varStr = privateMemberName(varName)
 
     val args = getRawIdExpr(varName, rep)
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala
index 21868c146..83db9c114 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/NimCompiler.scala
@@ -61,7 +61,7 @@ class NimCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def universalFooter: Unit = {
     out.dec
   }
-  override def allocateIO(id: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val ioName = s"${idToStr(id)}Io"
     val arg = rep match {
       case NoRepeat => idToStr(id) + "Expr"
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/PHPCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/PHPCompiler.scala
index c2c4d1476..ee904ca2a 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/PHPCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/PHPCompiler.scala
@@ -236,7 +236,7 @@ class PHPCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(id: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val memberName = privateMemberName(id)
     val ioName = s"$$_io_${idToStr(id)}"
 
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/PerlCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/PerlCompiler.scala
index c8bfe5b0c..099e91ae1 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/PerlCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/PerlCompiler.scala
@@ -198,7 +198,7 @@ class PerlCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(id: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val memberName = privateMemberName(id)
 
     val args = rep match {
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/PythonCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/PythonCompiler.scala
index 37a75f323..04265376f 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/PythonCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/PythonCompiler.scala
@@ -229,7 +229,7 @@ class PythonCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
 
   override def normalIO: String = "self._io"
 
-  override def allocateIO(varName: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val varStr = privateMemberName(varName)
     val ioName = s"_io_${idToStr(varName)}"
 
@@ -265,7 +265,7 @@ class PythonCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def alignToByte(io: String): Unit =
     out.puts(s"$io.align_to_byte()")
 
-  override def attrDebugStart(attrId: Identifier, attrType: DataType, ios: Option[String], rep: RepeatSpec): Unit = {
+  override def attrDebugStart(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, ios: Option[String], rep: RepeatSpec): Unit = {
     ios.foreach { (io) =>
       val name = idToStr(attrId)
       rep match {
@@ -280,7 +280,7 @@ class PythonCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def attrDebugArrInit(attrId: Identifier, attrType: DataType): Unit =
     out.puts(s"self._debug['${idToStr(attrId)}']['arr'] = []")
 
-  override def attrDebugEnd(attrId: Identifier, attrType: DataType, io: String, rep: RepeatSpec): Unit = {
+  override def attrDebugEnd(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, io: String, rep: RepeatSpec): Unit = {
     val name = idToStr(attrId)
     rep match {
       case NoRepeat =>
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/RubyCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/RubyCompiler.scala
index ccda2646e..08a9b18c9 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/RubyCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/RubyCompiler.scala
@@ -233,7 +233,7 @@ class RubyCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     handleAssignment(varDest, expr, rep, false)
   }
 
-  override def allocateIO(id: Identifier, rep: RepeatSpec): String = {
+  override def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String = {
     val memberName = privateMemberName(id)
     val ioName = s"_io_${idToStr(id)}"
 
@@ -269,7 +269,7 @@ class RubyCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def alignToByte(io: String): Unit =
     out.puts(s"$io.align_to_byte")
 
-  override def attrDebugStart(attrId: Identifier, attrType: DataType, ios: Option[String], rep: RepeatSpec): Unit = {
+  override def attrDebugStart(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, ios: Option[String], rep: RepeatSpec): Unit = {
     ios.foreach { (io) =>
       val name = idToStr(attrId)
       rep match {
@@ -286,7 +286,7 @@ class RubyCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
   override def attrDebugArrInit(attrId: Identifier, attrType: DataType): Unit =
     out.puts(s"@_debug['${idToStr(attrId)}'][:arr] = []")
 
-  override def attrDebugEnd(attrId: Identifier, attrType: DataType, io: String, rep: RepeatSpec): Unit = {
+  override def attrDebugEnd(attrId: Identifier, attrType: DataType, attrRep: RepeatSpec, io: String, rep: RepeatSpec): Unit = {
     val name = idToStr(attrId)
     rep match {
       case NoRepeat =>
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala b/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala
index b0e885e7b..95fb76608 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/RustCompiler.scala
@@ -928,7 +928,7 @@ class RustCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
     out.puts("}")
   }
 
-  override def allocateIO(id: Identifier, rep: RepeatSpec): String = {//= privateMemberName(IoIdentifier)
+  override def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String = {//= privateMemberName(IoIdentifier)
     val memberName = privateMemberName(id)
     val ioId = IoStorageIdentifier(id)
 
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateAndStoreIO.scala b/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateAndStoreIO.scala
index 33fe36608..0e5c0bd6a 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateAndStoreIO.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateAndStoreIO.scala
@@ -9,7 +9,14 @@ import io.kaitai.struct.format._
   * keep track of allocated IOs.
   */
 trait AllocateAndStoreIO extends ExtraAttrs {
-  def allocateIO(id: Identifier, rep: RepeatSpec): String
+  /**
+   * Generates code that create new input stream for read specified field content
+   *
+   * @param id Name of variable that used to store field for which stream is created
+   * @param rep Repeat specification for the [[id]] field
+   * @param currentIo Name of current stream variable, that used to read data currently
+   */
+  def allocateIO(id: Identifier, rep: RepeatSpec, currentIo: String): String
 
   override def extraAttrForIO(id: Identifier, rep: RepeatSpec): List[AttrSpec] =
     List(AttrSpec(List(), IoStorageIdentifier(id), OwnedKaitaiStreamType, ConditionalSpec(None, rep)))
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateIOLocalVar.scala b/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateIOLocalVar.scala
index fd84dce12..eaa0467c7 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateIOLocalVar.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/components/AllocateIOLocalVar.scala
@@ -7,7 +7,14 @@ import io.kaitai.struct.format.{AttrSpec, Identifier, RepeatSpec}
   * probably garbage collector will deal with them.
   */
 trait AllocateIOLocalVar extends ExtraAttrs {
-  def allocateIO(varName: Identifier, rep: RepeatSpec): String
+  /**
+   * Generates code that create new input stream for read specified field content
+   *
+   * @param id Name of variable that used to store field for which stream is created
+   * @param rep Repeat specification for the [[id]] field
+   * @param currentIo Name of current stream variable, that used to read data currently
+   */
+  def allocateIO(varName: Identifier, rep: RepeatSpec, currentIo: String): String
 
   override def extraAttrForIO(id: Identifier, rep: RepeatSpec): List[AttrSpec] = List()
 }
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/components/CommonReads.scala b/shared/src/main/scala/io/kaitai/struct/languages/components/CommonReads.scala
index de049dc14..1db627163 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/components/CommonReads.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/components/CommonReads.scala
@@ -28,7 +28,7 @@ trait CommonReads extends LanguageCompiler {
     val needsArrayDebug = attrDebugNeeded(id) && attr.cond.repeat != NoRepeat
 
     if (needsArrayDebug) {
-      attrDebugStart(id, attr.dataType, Some(io), NoRepeat)
+      attrDebugStart(id, attr.dataType, attr.cond.repeat, Some(io), NoRepeat)
       attrDebugArrInit(id, attr.dataType)
     }
 
@@ -45,7 +45,7 @@ trait CommonReads extends LanguageCompiler {
     }
 
     if (needsArrayDebug)
-      attrDebugEnd(id, attr.dataType, io, NoRepeat)
+      attrDebugEnd(id, attr.dataType, attr.cond.repeat, io, NoRepeat)
 
     // More position management + set calculated flag after parsing for ParseInstanceSpecs
     attr match {
@@ -74,12 +74,12 @@ trait CommonReads extends LanguageCompiler {
 
     val needsDebug = attrDebugNeeded(id)
     if (needsDebug)
-      attrDebugStart(id, attr.dataType, Some(io), attr.cond.repeat)
+      attrDebugStart(id, attr.dataType, attr.cond.repeat, Some(io), attr.cond.repeat)
 
     attrParse2(id, attr.dataType, io, attr.cond.repeat, false, defEndian)
 
     if (needsDebug)
-      attrDebugEnd(id, attr.dataType, io, attr.cond.repeat)
+      attrDebugEnd(id, attr.dataType, attr.cond.repeat, io, attr.cond.repeat)
 
     attrValidateAll(attr)
     attr.cond.repeat match {
@@ -95,9 +95,9 @@ trait CommonReads extends LanguageCompiler {
 
   def attrParse2(id: Identifier, dataType: DataType, io: String, rep: RepeatSpec, isRaw: Boolean, defEndian: Option[FixedEndian], assignType: Option[DataType] = None): Unit
 
-  def attrDebugStart(attrId: Identifier, attrType: DataType, io: Option[String], repeat: RepeatSpec): Unit = {}
+  def attrDebugStart(attrName: Identifier, attrType: DataType, attrRep: RepeatSpec, io: Option[String], repeat: RepeatSpec): Unit = {}
   def attrDebugArrInit(attrId: Identifier, attrType: DataType): Unit = {}
-  def attrDebugEnd(attrName: Identifier, attrType: DataType, io: String, repeat: RepeatSpec): Unit = {}
+  def attrDebugEnd(attrName: Identifier, attrType: DataType, attrRep: RepeatSpec, io: String, repeat: RepeatSpec): Unit = {}
 
   def attrDebugNeeded(attrId: Identifier): Boolean = {
     if (!config.readStoresPos)
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/components/EveryReadIsExpression.scala b/shared/src/main/scala/io/kaitai/struct/languages/components/EveryReadIsExpression.scala
index 887239370..0517377e1 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/components/EveryReadIsExpression.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/components/EveryReadIsExpression.scala
@@ -186,9 +186,9 @@ trait EveryReadIsExpression
 
     this match {
       case thisStore: AllocateAndStoreIO =>
-        thisStore.allocateIO(rawId, rep)
+        thisStore.allocateIO(rawId, rep, io)
       case thisLocal: AllocateIOLocalVar =>
-        thisLocal.allocateIO(rawId, rep)
+        thisLocal.allocateIO(rawId, rep, io)
     }
   }
 
@@ -245,7 +245,7 @@ trait EveryReadIsExpression
 
   def instanceCalculate(instName: Identifier, dataType: DataType, value: Ast.expr): Unit = {
     if (attrDebugNeeded(instName))
-      attrDebugStart(instName, dataType, None, NoRepeat)
+      attrDebugStart(instName, dataType, NoRepeat, None, NoRepeat)
     handleAssignmentSimple(instName, expression(value))
   }
 }
diff --git a/shared/src/main/scala/io/kaitai/struct/languages/components/GoReads.scala b/shared/src/main/scala/io/kaitai/struct/languages/components/GoReads.scala
index 9772ab647..d539723e5 100644
--- a/shared/src/main/scala/io/kaitai/struct/languages/components/GoReads.scala
+++ b/shared/src/main/scala/io/kaitai/struct/languages/components/GoReads.scala
@@ -131,9 +131,9 @@ trait GoReads extends CommonReads with ObjectOrientedLanguage with GoSwitchOps {
 
         this match {
           case thisStore: AllocateAndStoreIO =>
-            thisStore.allocateIO(rawId, rep)
+            thisStore.allocateIO(rawId, rep, io)
           case thisLocal: AllocateIOLocalVar =>
-            thisLocal.allocateIO(rawId, rep)
+            thisLocal.allocateIO(rawId, rep, io)
         }
       case _: UserTypeInstream =>
         // no fixed buffer, just use regular IO