SI-7779 Account for class name compactification in reflection

We have to assume that the classes we are reflecting on were
compiled with the default value for -Xmax-classfile-name (255).

With this assumption, we can apply the same name compactification
as done in the regular compiler.

The REPL is particularly prone to generating long class names
with the '$iw' prefixes, so this is an important fix for runtime
reflection.

Also adds support for getting the runtime class of `O.type` if
`O` is a module.

1 files changed, 12 insertions, 0 deletions

diff --git a/bincompat-forward.whitelist.conf b/bincompat-forward.whitelist.conf
index 7fdd4329ea..20e5e30b68 100644
--- a/bincompat-forward.whitelist.conf
+++ b/bincompat-forward.whitelist.conf
@@ -571,6 +571,18 @@ filter {
         {
             matchName="scala.reflect.internal.SymbolTable.scala$reflect$internal$Trees$$duplicator"
             problemName=IncompatibleResultTypeProblem
+        },
+        {
+            matchName="scala.reflect.runtime.JavaMirrors#JavaMirror.scala$reflect$runtime$JavaMirrors$JavaMirror$$PackageAndClassPattern"
+            problemName=MissingMethodProblem
+        },
+        {
+            matchName="scala.reflect.internal.SymbolTable.compactifyName"
+            problemName=MissingMethodProblem
+        },
+        {
+            matchName="scala.reflect.internal.StdNames.compactifyName"
+            problemName=MissingMethodProblem
         }
     ]
 }