File class lowering

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrFile.kt

@@ -18,8 +18,10 @@ package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
+import org.jetbrains.kotlin.descriptors.annotations.checkAnnotationName
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.SourceManager
+import org.jetbrains.kotlin.name.FqName
 
 interface IrFile : IrElement, IrDeclarationContainer {
     val fileEntry: SourceManager.FileEntry
@@ -37,4 +39,7 @@ interface IrFile : IrElement, IrDeclarationContainer {
     }
 }
 
-val IrFile.name: String get() = fileEntry.name
+val IrFile.name: String get() = fileEntry.name
+
+fun IrFile.findAnnotationsByFqName(fqName: FqName) =
+        fileAnnotations.filter { checkAnnotationName(it, fqName) }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrClassImpl.kt

@@ -73,10 +73,10 @@ class IrClassImpl(
 }
 
 class IrClassBuilderImpl(
-        override val startOffset: Int,
-        override val endOffset: Int,
+        override var startOffset: Int,
+        override var endOffset: Int,
         override var origin: IrDeclarationOrigin,
-        override val descriptor: ClassDescriptor,
+        override var descriptor: ClassDescriptor,
         override val declarations: MutableList<IrDeclaration>
 ) : IrClass.Builder {
     constructor(irClass: IrClass) : this(irClass.startOffset, irClass.endOffset, irClass.origin, irClass.descriptor,