1 files changed, 61 insertions, 0 deletions
diff --git a/test/dotty/tools/backend/jvm/AsmNode.scala b/test/dotty/tools/backend/jvm/AsmNode.scala
new file mode 100644
index 000000000..ac3f34258
--- /dev/null
+++ b/test/dotty/tools/backend/jvm/AsmNode.scala
@@ -0,0 +1,61 @@
+package dotty.tools.backend.jvm
+
+import java.lang.reflect.Modifier
+import scala.tools.asm
+import asm._
+import asm.tree._
+import scala.collection.JavaConverters._
+
+sealed trait AsmNode[+T] {
+  def node: T
+  def access: Int
+  def desc: String
+  def name: String
+  def signature: String
+  def attrs: List[Attribute]
+  def visibleAnnotations: List[AnnotationNode]
+  def invisibleAnnotations: List[AnnotationNode]
+  def characteristics = f"$name%15s $desc%-30s$accessString$sigString"
+  def erasedCharacteristics = f"$name%15s $desc%-30s$accessString"
+
+  private def accessString     = if (access == 0) "" else " " + Modifier.toString(access)
+  private def sigString        = if (signature == null) "" else " " + signature
+  override def toString        = characteristics
+}
+
+object AsmNode {
+  type AsmMethod = AsmNode[MethodNode]
+  type AsmField = AsmNode[FieldNode]
+  type AsmMember = AsmNode[_]
+
+  implicit class ClassNodeOps(val node: ClassNode) {
+    def fieldsAndMethods: List[AsmMember] = {
+      val xs: List[AsmMember] = (
+           node.methods.asScala.toList.map(x => (x: AsmMethod))
+        ++ node.fields.asScala.toList.map(x => (x: AsmField))
+      )
+      xs sortBy (_.characteristics)
+    }
+  }
+  implicit class AsmMethodNode(val node: MethodNode) extends AsmNode[MethodNode] {
+    def access: Int                                = node.access
+    def desc: String                               = node.desc
+    def name: String                               = node.name
+    def signature: String                          = node.signature
+    def attrs: List[Attribute]                     = node.attrs.asScala.toList
+    def visibleAnnotations: List[AnnotationNode]   = node.visibleAnnotations.asScala.toList
+    def invisibleAnnotations: List[AnnotationNode] = node.invisibleAnnotations.asScala.toList
+  }
+  implicit class AsmFieldNode(val node: FieldNode) extends AsmNode[FieldNode] {
+    def access: Int                                = node.access
+    def desc: String                               = node.desc
+    def name: String                               = node.name
+    def signature: String                          = node.signature
+    def attrs: List[Attribute]                     = node.attrs.asScala.toList
+    def visibleAnnotations: List[AnnotationNode]   = node.visibleAnnotations.asScala.toList
+    def invisibleAnnotations: List[AnnotationNode] = node.invisibleAnnotations.asScala.toList
+  }
+
+  def apply(node: MethodNode): AsmMethodNode = new AsmMethodNode(node)
+  def apply(node: FieldNode): AsmFieldNode   = new AsmFieldNode(node)
+}