SI-9105 Fix EnclosingMethod for classes defined in lambdas

This change fixes both GenASM and GenBCode, except for the change
to renaming in LamdaLift mentioned below.

The reason for an inconsistent EnclosingMethod attribute was the
symbol owner chain. Initially, closure class symbols don't exist, they
are only created in UnCurry (delambdafy:inline). So walking the
originalOwner of a definition does not yield closure classes.

The commit also fixes uses of isAnonymousClass, isAnonymousFunction
and isDelambdafyFunction in two ways:

  1. by phase-travelling to an early phase. after flatten, the name
     includes the name of outer classes, so the properties may become
     accidentally true (they check for a substring in the name)

  2. by ensuring that the (destructive) renames during LambdaLift
     don't make the above properties accidentally true. This was in
     fact the cause for SI-8900.

1 files changed, 38 insertions, 0 deletions

diff --git a/test/files/jvm/innerClassAttribute/Classes_1.scala b/test/files/jvm/innerClassAttribute/Classes_1.scala
index 9c3ea7f013..a2ade70c18 100644
--- a/test/files/jvm/innerClassAttribute/Classes_1.scala
+++ b/test/files/jvm/innerClassAttribute/Classes_1.scala
@@ -185,3 +185,41 @@ trait A24 extends A24Base {
     override object Conc extends A24Sym
   }
 }
+
+class SI_9105 {    
+  // the EnclosingMethod attributes depend on the delambdafy strategy (inline vs method)
+
+                                       //  outerClass-inline   enclMeth-inline   outerClass-method   enclMeth-method                    
+  val fun = () => {
+    class A                            //     closure             null (*)            SI_9105           null
+    def m: Object = { class B; new B } //     closure              m$1                SI_9105            m$1
+    val f: Object = { class C; new C } //     closure             null (*)            SI_9105           null
+  }
+  def met = () => {
+    class D                            //     closure             null (*)            SI_9105            met
+    def m: Object = { class E; new E } //     closure              m$1                SI_9105            m$1
+    val f: Object = { class F; new F } //     closure             null (*)            SI_9105            met
+  }
+
+  // (*) the originalOwner chain of A (similar for D) is: SI_9105.fun.$anonfun-value.A
+  //     we can get to the anonfun-class (created by uncurry), but not to the apply method.
+  //
+  //     for C and F, the originalOwner chain is fun.$anonfun-value.f.C. at later phases, the rawowner of f is
+  //     an apply$sp method of the closure class. we could use that as enclosing method, but it would be unsystematic
+  //     (A / D don't have an encl meth either), and also strange to use the $sp, which is a compilation artifact.
+  //     So using `null` looks more like the situation in the source code: C / F are nested classes of the anon-fun, and
+  //     there's no method in between.
+
+  def byName[T](op: => T) = 0
+
+  val bnV = byName {
+    class G                            //     closure             null (*)            SI_9105           null
+    def m: Object = { class H; new H } //     closure              m$1                SI_9105            m$1
+    val f: Object = { class I; new I } //     closure             null (*)            SI_9105           null
+  }
+  def bnM = byName {
+    class J                            //     closure             null (*)            SI_9105            bnM
+    def m: Object = { class K; new K } //     closure              m$1                SI_9105            m$1
+    val f: Object = { class L; new L } //     closure             null (*)            SI_9105            bnM
+  }
+}