1 files changed, 5 insertions, 2 deletions
diff --git a/src/compiler/scala/tools/nsc/symtab/classfile/ClassfileParser.scala b/src/compiler/scala/tools/nsc/symtab/classfile/ClassfileParser.scala
index 660028eab8..99e61d2482 100644
--- a/src/compiler/scala/tools/nsc/symtab/classfile/ClassfileParser.scala
+++ b/src/compiler/scala/tools/nsc/symtab/classfile/ClassfileParser.scala
@@ -84,6 +84,9 @@ abstract class ClassfileParser {
   protected final def u2(): Int = in.nextChar.toInt
   protected final def u4(): Int = in.nextInt
 
+  protected final def s1(): Int = in.nextByte.toInt // sign-extend the byte to int
+  protected final def s2(): Int = (in.nextByte.toInt << 8) | u1 // sign-extend and shift the first byte, or with the unsigned second byte
+
   private def readInnerClassFlags() = readClassFlags()
   private def readClassFlags()      = JavaAccFlags classFlags u2
   private def readMethodFlags()     = JavaAccFlags methodFlags u2
@@ -284,7 +287,7 @@ abstract class ClassfileParser {
 
     def getType(index: Int): Type              = getType(null, index)
     def getType(sym: Symbol, index: Int): Type = sigToType(sym, getExternalName(index))
-    def getSuperClass(index: Int): Symbol      = if (index == 0) AnyClass else getClassSymbol(index)
+    def getSuperClass(index: Int): Symbol      = if (index == 0) AnyClass else getClassSymbol(index) // the only classfile that is allowed to have `0` in the super_class is java/lang/Object (see jvm spec)
 
     private def createConstant(index: Int): Constant = {
       val start = starts(index)
@@ -862,7 +865,7 @@ abstract class ClassfileParser {
           srcfile0 = settings.outputDirs.srcFilesFor(in.file, srcpath).find(_.exists)
         case tpnme.CodeATTR =>
           if (sym.owner.isInterface) {
-            sym setFlag DEFAULTMETHOD
+            sym setFlag JAVA_DEFAULTMETHOD
             log(s"$sym in ${sym.owner} is a java8+ default method.")
           }
           in.skip(attrLen)