Experiment: add new SourceInvisble TASTy flag

Author: bishabosha

compiler/src/dotty/tools/dotc/core/Denotations.scala

@@ -1074,7 +1074,7 @@ object Denotations {
     def filterDisjoint(denots: PreDenotation)(using Context): SingleDenotation =
       if (denots.exists && denots.matches(this)) NoDenotation else this
     def filterWithFlags(required: FlagSet, excluded: FlagSet)(using Context): SingleDenotation =
-      val realExcluded = if ctx.isAfterTyper then excluded else excluded | Invisible
+      val realExcluded = if ctx.isAfterTyper then excluded else excluded | Invisible | (if ctx.mode.is(Mode.ResolveFromTASTy) then EmptyFlags else SourceInvisible)
       def symd: SymDenotation = this match
         case symd: SymDenotation => symd
         case _ => symbol.denot

compiler/src/dotty/tools/dotc/core/Flags.scala

@@ -380,6 +380,9 @@ object Flags {
   /** Tracked modifier for class parameter / a class with some tracked parameters */
   val (Tracked @ _, _, Dependent @ _) = newFlags(46, "tracked")
 
+  /** Symbol can not be resolved from source during typer. PROVISIONAL (possibly replace with `Invisible` with new semantics) */
+  val (SourceInvisible @ _, _, _) = newFlags(47, "<source-invisible>")
+
   // ------------ Flags following this one are not pickled ----------------------------------
 
   /** Symbol is not a member of its owner */
@@ -471,7 +474,7 @@ object Flags {
     Scala2SpecialFlags, MutableOrOpen, Opaque, Touched, JavaStatic,
     OuterOrCovariant, LabelOrContravariant, CaseAccessor, Tracked,
     Extension, NonMember, Implicit, Given, Permanent, Synthetic, Exported,
-    SuperParamAliasOrScala2x, Inline, Macro, ConstructorProxy, Invisible)
+    SuperParamAliasOrScala2x, Inline, Macro, ConstructorProxy, Invisible, SourceInvisible)
 
   /** Flags that are not (re)set when completing the denotation, or, if symbol is
    *  a top-level class or object, when completing the denotation once the class
@@ -525,7 +528,7 @@ object Flags {
   val RetainedModuleValAndClassFlags: FlagSet =
     AccessFlags | Package | Case |
     Synthetic | JavaDefined | JavaStatic | Artifact |
-    Lifted | MixedIn | Specialized | ConstructorProxy | Invisible | Erased
+    Lifted | MixedIn | Specialized | ConstructorProxy | Invisible | SourceInvisible | Erased
 
   /** Flags that can apply to a module val */
   val RetainedModuleValFlags: FlagSet = RetainedModuleValAndClassFlags |

compiler/src/dotty/tools/dotc/core/Mode.scala

@@ -105,7 +105,7 @@ object Mode {
 
   /** Use previous Scheme for implicit resolution. Currently significant
    *  in 3.0-migration where we use Scala-2's scheme instead and in 3.5 and 3.6-migration
-   *  where we use the previous scheme up to 3.4 for comparison with the new scheme. 
+   *  where we use the previous scheme up to 3.4 for comparison with the new scheme.
    */
   val OldImplicitResolution: Mode = newMode(15, "OldImplicitResolution")
 
@@ -125,6 +125,9 @@ object Mode {
   /** Read original positions when unpickling from TASTY */
   val ReadPositions: Mode = newMode(17, "ReadPositions")
 
+  /** We are resolving a SELECT name from TASTy */
+  val ResolveFromTASTy: Mode = newMode(18, "ResolveFromTASTy")
+
   /** We are elaborating the fully qualified name of a package clause.
    *  In this case, identifiers should never be imported.
    */

compiler/src/dotty/tools/dotc/core/NamerOps.scala

@@ -110,7 +110,7 @@ object NamerOps:
     else NoSymbol.assertingErrorsReported(em"no companion $name in $scope")
 
   /** If a class has one of these flags, it does not get a constructor companion */
-  private val NoConstructorProxyNeededFlags = Abstract | Trait | Case | Synthetic | Module | Invisible
+  private val NoConstructorProxyNeededFlags = Abstract | Trait | Case | Synthetic | Module | Invisible | SourceInvisible
 
   /** The flags of a constructor companion */
   private val ConstructorCompanionFlags = Synthetic | ConstructorProxy

compiler/src/dotty/tools/dotc/core/SymDenotations.scala

@@ -617,7 +617,7 @@ object SymDenotations {
       case _ =>
         // Otherwise, no completion is necessary, see the preconditions of `markAbsent()`.
         (myInfo `eq` NoType)
-        || is(Invisible) && ctx.isTyper
+        || (is(Invisible) || is(SourceInvisible) && !ctx.mode.is(Mode.ResolveFromTASTy)) && ctx.isTyper
         || is(ModuleVal, butNot = Package) && moduleClass.isAbsent(canForce)
     }
 

compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala

@@ -881,6 +881,7 @@ class TreePickler(pickler: TastyPickler, attributes: Attributes) {
     if flags.is(Transparent) then writeModTag(TRANSPARENT)
     if flags.is(Infix) then writeModTag(INFIX)
     if flags.is(Invisible) then writeModTag(INVISIBLE)
+    if flags.is(SourceInvisible) then writeModTag(SOURCEINVISIBLE)
     if (flags.is(Erased)) writeModTag(ERASED)
     if (flags.is(Exported)) writeModTag(EXPORTED)
     if (flags.is(Given)) writeModTag(GIVEN)

compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala

@@ -754,6 +754,7 @@ class TreeUnpickler(reader: TastyReader,
           case EXPORTED => addFlag(Exported)
           case OPEN => addFlag(Open)
           case INVISIBLE => addFlag(Invisible)
+          case SOURCEINVISIBLE => addFlag(SourceInvisible)
           case TRANSPARENT => addFlag(Transparent)
           case INFIX => addFlag(Infix)
           case TRACKED => addFlag(Tracked)
@@ -1561,7 +1562,7 @@ class TreeUnpickler(reader: TastyReader,
                *  - sbt-test/tasty-compat/remove-override
                *  - sbt-test/tasty-compat/move-method
                */
-              def lookupInSuper =
+              def lookupInSuper(using Context) =
                 val cls = ownerTpe.classSymbol
                 if cls.exists then
                   cls.asClass.classDenot
@@ -1570,14 +1571,29 @@ class TreeUnpickler(reader: TastyReader,
                 else
                   NoDenotation
 
-              val denot =
+
+              def searchDenot(using Context): Denotation =
                 if owner.is(JavaAnnotation) && name == nme.CONSTRUCTOR then
                   // #19951 Fix up to read TASTy produced before 3.5.0 -- ignore the signature
                   ownerTpe.nonPrivateDecl(name).asSeenFrom(prefix)
                 else
                   val d = ownerTpe.decl(name).atSignature(sig, target)
                   (if !d.exists then lookupInSuper else d).asSeenFrom(prefix)
 
+              val denot0 = inContext(ctx.addMode(Mode.ResolveFromTASTy)):
+                searchDenot // able to resolve SourceInvisible members
+
+              val denot =
+                if
+                  denot0.symbol.exists
+                  && denot0.symbol.is(SourceInvisible)
+                  && denot0.symbol.isDefinedInSource
+                then
+                  searchDenot // fallback
+                else
+                  denot0
+
+
               makeSelect(qual, name, denot)
             case REPEATED =>
               val elemtpt = readTpt()

compiler/src/dotty/tools/dotc/transform/UnrollDefinitions.scala

@@ -26,7 +26,7 @@ import dotty.tools.unreachable
 /**Implementation of SIP-61.
  * Runs when `@unroll` annotations are found in a compilation unit, installing new definitions
  *
- * Note that it only generates `Invisible` methods, so no interactions with Zinc/SemanticDB
+ * Note that it only generates `SourceInvisible` methods, so no interactions with Zinc/SemanticDB
  */
 class UnrollDefinitions extends MacroTransform, IdentityDenotTransformer {
   self =>
@@ -127,7 +127,7 @@ class UnrollDefinitions extends MacroTransform, IdentityDenotTransformer {
         defdef.symbol.owner,
         defdef.name,
         defdef.symbol.flags &~ HasDefaultParams |
-        Invisible | Synthetic,
+        SourceInvisible | Synthetic,
         NoType, // fill in later
         coord = nextSymbol.span.shift(1) // shift by 1 to avoid "secondary constructor must call preceding" error
       ).entered

compiler/src/scala/quoted/runtime/impl/QuotesImpl.scala

@@ -2955,6 +2955,7 @@ class QuotesImpl private (using val ctx: Context) extends Quotes, QuoteUnpickler
       def Infix: Flags = dotc.core.Flags.Infix
       def Inline: Flags = dotc.core.Flags.Inline
       def Invisible: Flags = dotc.core.Flags.Invisible
+      def SourceInvisible: Flags = dotc.core.Flags.SourceInvisible
       def JavaDefined: Flags = dotc.core.Flags.JavaDefined
       def JavaStatic: Flags = dotc.core.Flags.JavaStatic
       def JavaAnnotation: Flags = dotc.core.Flags.JavaAnnotation

library/src/scala/quoted/Quotes.scala

@@ -4588,6 +4588,10 @@ trait Quotes { self: runtime.QuoteUnpickler & runtime.QuoteMatching =>
       /** Is this symbol invisible when typechecking? */
       def Invisible: Flags
 
+      /** Is this symbol invisible when typechecking? (only from source) */
+      @experimental
+      def SourceInvisible: Flags
+
       /** Is this symbol defined in a Java class */
       def JavaDefined: Flags