diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/DeepCopyIrTreeWithDescriptoros.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/DeepCopyIrTreeWithDescriptoros.kt
index 2946a4f5a4c..bd4f8c8064a 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/DeepCopyIrTreeWithDescriptoros.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/DeepCopyIrTreeWithDescriptoros.kt
@@ -36,7 +36,7 @@ import org.jetbrains.kotlin.types.TypeSubstitutor
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.types.typeUtil.makeNullable
 
-internal class DeepCopyIrTreeWithDescriptors(val targetDescriptor: FunctionDescriptor,
+class DeepCopyIrTreeWithDescriptors(val targetDescriptor: FunctionDescriptor,
                                              val context: CommonBackendContext) {
 
     private val descriptorSubstituteMap: MutableMap<DeclarationDescriptor, DeclarationDescriptor> = mutableMapOf()
@@ -553,9 +553,9 @@ internal class DeepCopyIrTreeWithDescriptors(val targetDescriptor: FunctionDescr
 
 }
 
-internal class SubstitutedDescriptor(val inlinedFunction: FunctionDescriptor, val descriptor: DeclarationDescriptor)
+class SubstitutedDescriptor(val inlinedFunction: FunctionDescriptor, val descriptor: DeclarationDescriptor)
 
-internal class DescriptorSubstitutorForExternalScope(val globalSubstituteMap: MutableMap<DeclarationDescriptor, SubstitutedDescriptor>)
+class DescriptorSubstitutorForExternalScope(val globalSubstituteMap: MutableMap<DeclarationDescriptor, SubstitutedDescriptor>)
     : IrElementTransformerVoidWithContext() {
 
     override fun visitCall(expression: IrCall): IrExpression {
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt
index 747e83ceab5..48ad3d2e967 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt
@@ -28,10 +28,10 @@ abstract class Ir<out T: CommonBackendContext>(val context: T, val irModule: IrM
 
 abstract class Symbols<out T: CommonBackendContext>(val context: T, private val symbolTable: SymbolTable) {
 
-    private val builtIns
+    protected val builtIns
         get() = context.builtIns
 
-    private fun builtInsPackage(vararg packageNameSegments: String) =
+    protected fun builtInsPackage(vararg packageNameSegments: String) =
             context.builtIns.builtInsModule.getPackage(FqName.fromSegments(listOf(*packageNameSegments))).memberScope
 
     val refClass = symbolTable.referenceClass(context.getInternalClass("Ref"))
@@ -121,7 +121,7 @@ abstract class Symbols<out T: CommonBackendContext>(val context: T, private val
     }
 
 
-    private val arrayTypes = arrayOf(
+    protected val arrayTypes = arrayOf(
             builtIns.getPrimitiveArrayKotlinType(PrimitiveType.BYTE),
             builtIns.getPrimitiveArrayKotlinType(PrimitiveType.CHAR),
             builtIns.getPrimitiveArrayKotlinType(PrimitiveType.SHORT),
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt
index 0b71d4ca629..d00f69f7571 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt
@@ -65,7 +65,7 @@ fun DeclarationDescriptor.createFakeOverrideDescriptor(owner: ClassDescriptor):
     }
 }
 
-internal fun FunctionDescriptor.createOverriddenDescriptor(owner: ClassDescriptor, final: Boolean = true): FunctionDescriptor {
+fun FunctionDescriptor.createOverriddenDescriptor(owner: ClassDescriptor, final: Boolean = true): FunctionDescriptor {
     return this.newCopyBuilder()
             .setOwner(owner)
             .setCopyOverrides(true)
@@ -76,7 +76,7 @@ internal fun FunctionDescriptor.createOverriddenDescriptor(owner: ClassDescripto
     }
 }
 
-internal fun ClassDescriptor.createSimpleDelegatingConstructorDescriptor(superConstructorDescriptor: ClassConstructorDescriptor, isPrimary: Boolean = false)
+fun ClassDescriptor.createSimpleDelegatingConstructorDescriptor(superConstructorDescriptor: ClassConstructorDescriptor, isPrimary: Boolean = false)
         : ClassConstructorDescriptor {
     val constructorDescriptor = ClassConstructorDescriptorImpl.createSynthesized(
             /* containingDeclaration = */ this,
@@ -91,7 +91,7 @@ internal fun ClassDescriptor.createSimpleDelegatingConstructorDescriptor(superCo
     return constructorDescriptor
 }
 
-internal fun IrClass.addSimpleDelegatingConstructor(superConstructorSymbol: IrConstructorSymbol,
+fun IrClass.addSimpleDelegatingConstructor(superConstructorSymbol: IrConstructorSymbol,
                                                     constructorDescriptor: ClassConstructorDescriptor,
                                                     origin: IrDeclarationOrigin)
         : IrConstructor {
@@ -117,7 +117,7 @@ internal fun IrClass.addSimpleDelegatingConstructor(superConstructorSymbol: IrCo
     }
 }
 
-internal fun CommonBackendContext.createArrayOfExpression(arrayElementType: KotlinType,
+fun CommonBackendContext.createArrayOfExpression(arrayElementType: KotlinType,
                                              arrayElements: List<IrExpression>,
                                              startOffset: Int, endOffset: Int): IrExpression {
 
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/StringConcatenationLowering.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/StringConcatenationLowering.kt
index 5ce34fbc91d..834ec2e2c2f 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/StringConcatenationLowering.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/StringConcatenationLowering.kt
@@ -41,7 +41,7 @@ import org.jetbrains.kotlin.types.KotlinType
 /**
  * This lowering pass replaces [IrStringConcatenation]s with StringBuilder appends.
  */
-internal class StringConcatenationLowering(val context: CommonBackendContext) : FileLoweringPass {
+class StringConcatenationLowering(val context: CommonBackendContext) : FileLoweringPass {
     override fun lower(irFile: IrFile) {
         irFile.transformChildrenVoid(StringConcatenationTransformer(this))
     }