diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt
index ca4f87d8047..ac0f8c64e69 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGBuilder.kt
@@ -240,7 +240,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
 
             override fun visitFunction(declaration: IrFunction) {
                 declaration.body?.let {
-                    DEBUG_OUTPUT(1) {
+                    DEBUG_OUTPUT(0) {
                         println("Analysing function ${declaration.descriptor}")
                         println("IR: ${ir2stringWhole(declaration)}")
                     }
@@ -250,7 +250,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
 
             override fun visitField(declaration: IrField) {
                 declaration.initializer?.let {
-                    DEBUG_OUTPUT(1) {
+                    DEBUG_OUTPUT(0) {
                         println("Analysing global field ${declaration.descriptor}")
                         println("IR: ${ir2stringWhole(declaration)}")
                     }
@@ -263,7 +263,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
                 val visitor = ElementFinderVisitor()
                 body.acceptVoid(visitor)
 
-                DEBUG_OUTPUT(1) {
+                DEBUG_OUTPUT(0) {
                     println("FIRST PHASE")
                     visitor.variableValues.elementData.forEach { t, u ->
                         println("VAR $t:")
@@ -279,7 +279,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
                 // Compute transitive closure of possible values for variables.
                 visitor.variableValues.computeClosure()
 
-                DEBUG_OUTPUT(1) {
+                DEBUG_OUTPUT(0) {
                     println("SECOND PHASE")
                     visitor.variableValues.elementData.forEach { t, u ->
                         println("VAR $t:")
@@ -292,7 +292,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
                 val function = FunctionDFGBuilder(expressionValuesExtractor, visitor.variableValues,
                         descriptor, visitor.expressions, visitor.returnValues, visitor.thrownValues).build()
 
-                DEBUG_OUTPUT(1) {
+                DEBUG_OUTPUT(0) {
                     function.debugOutput()
                 }
 
@@ -300,7 +300,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
             }
         }, data = null)
 
-        DEBUG_OUTPUT(2) {
+        DEBUG_OUTPUT(1) {
             println("SYMBOL TABLE:")
             symbolTable.classMap.forEach { descriptor, type ->
                 println("    DESCRIPTOR: $descriptor")
@@ -481,7 +481,7 @@ internal class ModuleDFGBuilder(val context: Context, val irModule: IrModuleFrag
                 return variables[descriptor as VariableDescriptor]!!
             }
             return nodes.getOrPut(expression) {
-                DEBUG_OUTPUT(1) {
+                DEBUG_OUTPUT(0) {
                     println("Converting expression")
                     println(ir2stringWhole(expression))
                 }
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGSerializer.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGSerializer.kt
index 3698ff50acd..adc497d6986 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGSerializer.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DFGSerializer.kt
@@ -694,7 +694,7 @@ internal object DFGSerializer {
         val symbolTable = moduleDFG.symbolTable
         val typeMap = (symbolTable.classMap.values + DataFlowIR.Type.Virtual).distinct().withIndex().associateBy({ it.value }, { it.index })
         val functionSymbolMap = symbolTable.functionMap.values.distinct().withIndex().associateBy({ it.value }, { it.index })
-        DEBUG_OUTPUT(1) {
+        DEBUG_OUTPUT(0) {
             println("TYPES: ${typeMap.size}, " +
                     "FUNCTIONS: ${functionSymbolMap.size}, " +
                     "PRIVATE FUNCTIONS: ${functionSymbolMap.keys.count { it is DataFlowIR.FunctionSymbol.Private }}, " +
@@ -841,7 +841,7 @@ internal object DFGSerializer {
         context.librariesWithDependencies.forEach { library ->
             val libraryDataFlowGraph = library.dataFlowGraph
 
-            DEBUG_OUTPUT(1) {
+            DEBUG_OUTPUT(0) {
                 println("Data flow graph size for lib '${library.libraryName}': ${libraryDataFlowGraph?.size ?: 0}")
             }
 
@@ -909,7 +909,7 @@ internal object DFGSerializer {
                     }
                 }
 
-                DEBUG_OUTPUT(1) {
+                DEBUG_OUTPUT(0) {
                     println("Lib: ${library.libraryName}, types: ${types.size}, functions: ${functionSymbols.size}")
                 }
 
@@ -1110,6 +1110,16 @@ internal object DFGSerializer {
             }
         }
 
+        DEBUG_OUTPUT(1) {
+            allTypes.forEach {
+                println(it)
+                println("    SUPER TYPES:")
+                it.superTypes.forEach {
+                    println("        $it")
+                }
+            }
+        }
+
         return ExternalModulesDFG(allTypes, publicTypesMap, publicFunctionsMap, functions)
     }
 }
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