scala-release: Adjust MiMa filters; Revert changes to tasty module

compiler/src/dotty/tools/dotc/config/ScalaRelease.scala

@@ -1,7 +1,5 @@
 package dotty.tools.dotc.config
 
-import dotty.tools.tasty.TastyVersion
-
 enum ScalaRelease(val majorVersion: Int, val minorVersion: Int) extends Ordered[ScalaRelease]:
   case Release3_0 extends ScalaRelease(3, 0)
   case Release3_1 extends ScalaRelease(3, 1)

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

@@ -38,8 +38,9 @@ import xsbti.AnalysisCallback
 import plugins._
 import java.util.concurrent.atomic.AtomicInteger
 import java.nio.file.InvalidPathException
-import dotty.tools.tasty.{ TastyFormat, TastyVersion }
+import dotty.tools.tasty.TastyFormat
 import dotty.tools.dotc.config.{ NoScalaVersion, SpecificScalaVersion, AnyScalaVersion, ScalaBuild }
+import dotty.tools.dotc.core.tasty.TastyVersion
 
 object Contexts {
 

compiler/src/dotty/tools/dotc/core/classfile/ClassfileParser.scala

@@ -3,7 +3,7 @@ package dotc
 package core
 package classfile
 
-import dotty.tools.tasty.{ TastyFormat, TastyReader, TastyHeaderUnpickler, TastyVersion }
+import dotty.tools.tasty.{ TastyFormat, TastyReader, TastyHeaderUnpickler }
 
 import Contexts._, Symbols._, Types._, Names._, StdNames._, NameOps._, Scopes._, Decorators._
 import SymDenotations._, unpickleScala2.Scala2Unpickler._, Constants._, Annotations._, util.Spans._
@@ -20,6 +20,7 @@ import java.util.UUID
 import scala.collection.immutable
 import scala.collection.mutable.{ ListBuffer, ArrayBuffer }
 import scala.annotation.switch
+import tasty.TastyVersion
 import typer.Checking.checkNonCyclic
 import io.{AbstractFile, PlainFile, ZipArchive}
 import scala.util.control.NonFatal
@@ -964,12 +965,12 @@ class ClassfileParser(
                               |found:           ${fileTastyVersion.show}
               """.stripMargin)
 
-            val isTastyReadable = TastyFormat.isVersionCompatible(fileVersion = fileTastyVersion, compilerVersion = TastyVersion.compilerVersion)
+            val isTastyReadable = fileTastyVersion.isCompatibleWith(TastyVersion.compilerVersion)
             if !isTastyReadable then
               reportWrongTasty("its TASTy format cannot be read by the compiler", TastyVersion.compilerVersion)
             else
               val isTastyCompatible =
-                TastyFormat.isVersionCompatible(fileVersion = fileTastyVersion, compilerVersion = ctx.tastyVersion) ||
+                fileTastyVersion.isCompatibleWith(ctx.tastyVersion) ||
                 classRoot.symbol.showFullName.startsWith("scala.") // References to stdlib are considered safe because we check the values of @since annotations
               if !isTastyCompatible then
                 reportWrongTasty(s"its TASTy format is not compatible with the one of the targeted Scala release (${ctx.scalaRelease.show})", ctx.tastyVersion)

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

@@ -10,7 +10,7 @@ import classfile.ClassfileParser
 import Names.SimpleName
 import TreeUnpickler.UnpickleMode
 
-import dotty.tools.tasty.{ TastyReader, TastyVersion }
+import dotty.tools.tasty.TastyReader
 import dotty.tools.tasty.TastyFormat.{ASTsSection, PositionsSection, CommentsSection}
 
 object DottyUnpickler {

tasty/src/dotty/tools/tasty/TastyVersion.scala → compiler/src/dotty/tools/dotc/core/tasty/TastyVersion.scala

@@ -1,7 +1,14 @@
-package dotty.tools.tasty
+package dotty.tools.dotc.core.tasty
+
+import dotty.tools.tasty.TastyFormat
 
 case class TastyVersion(major: Int, minor: Int, experimental: Int) {
-  def show = "" + major + "." + minor + "-" + experimental
+  def show = s"$major.$minor-$experimental"
+
+  def isCompatibleWith(that: TastyVersion): Boolean = TastyFormat.isVersionCompatible(
+    this.major, this.minor, this.experimental,
+    that.major, that.minor, that.experimental
+  )
 }
 
 object TastyVersion {
@@ -13,4 +20,4 @@ object TastyVersion {
     TastyVersion(tastyMajor, tastyMinor, 0)
   }
 
-}
+}

project/MiMaFilters.scala

@@ -25,5 +25,8 @@ object MiMaFilters {
     ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language.3.1"),
     ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$3$u002E1$"),
     ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$3$u002E1$minusmigration$"),
+
+    // Private to the compiler - needed for forward binary compatibility
+    ProblemFilters.exclude[MissingClassProblem]("scala.annotation.since")
   )
 }

tasty/src/dotty/tools/tasty/TastyFormat.scala

@@ -338,12 +338,16 @@ object TastyFormat {
    * @syntax markdown
    */
   def isVersionCompatible(
-    fileVersion: TastyVersion,
-    compilerVersion: TastyVersion
+    fileMajor: Int,
+    fileMinor: Int,
+    fileExperimental: Int,
+    compilerMajor: Int,
+    compilerMinor: Int,
+    compilerExperimental: Int
   ): Boolean = (
-    fileVersion.major == compilerVersion.major &&
-      (  fileVersion.minor == compilerVersion.minor && fileVersion.experimental == compilerVersion.experimental // full equality
-      || fileVersion.minor < compilerVersion.minor && fileVersion.experimental == 0 // stable backwards compatibility
+    fileMajor == compilerMajor &&
+      (  fileMinor == compilerMinor && fileExperimental == compilerExperimental // full equality
+      || fileMinor <  compilerMinor && fileExperimental == 0 // stable backwards compatibility
     )
   )
 

tasty/src/dotty/tools/tasty/TastyHeaderUnpickler.scala

@@ -45,8 +45,7 @@ class TastyHeaderUnpickler(reader: TastyReader) {
     val fileMajor = readNat()
     if (fileMajor <= 27) { // old behavior before `tasty-core` 3.0.0-M4
       val fileMinor = readNat()
-      val fileTastyVersion = TastyVersion(fileMajor, fileMinor, 0)
-      val signature = signatureString(fileTastyVersion, TastyVersion.compilerVersion)
+      val signature = signatureString(fileMajor, fileMinor, 0)
       throw new UnpickleException(signature + backIncompatAddendum + toolingAddendum)
     }
     else {
@@ -60,15 +59,17 @@ class TastyHeaderUnpickler(reader: TastyReader) {
         new String(bytes, start.index, length)
       }
 
-      val fileTastyVersion = TastyVersion(fileMajor, fileMinor, fileExperimental)
-
       val validVersion = TastyFormat.isVersionCompatible(
-        fileVersion = fileTastyVersion,
-        compilerVersion = TastyVersion.compilerVersion
+        fileMajor            = fileMajor,
+        fileMinor            = fileMinor,
+        fileExperimental     = fileExperimental,
+        compilerMajor        = MajorVersion,
+        compilerMinor        = MinorVersion,
+        compilerExperimental = ExperimentalVersion
       )
 
       check(validVersion, {
-        val signature = signatureString(fileTastyVersion, TastyVersion.compilerVersion)
+        val signature = signatureString(fileMajor, fileMinor, fileExperimental)
         val producedByAddendum = s"\nThe TASTy file was produced by $toolingVersion.$toolingAddendum"
         val msg = (
           if (fileExperimental != 0) unstableAddendum
@@ -99,16 +100,16 @@ object TastyHeaderUnpickler {
       ""
   )
 
-  private def signatureString(found: TastyVersion, expected: TastyVersion) = {
+  private def signatureString(fileMajor: Int, fileMinor: Int, fileExperimental: Int) = {
     def showMinorVersion(min: Int, exp: Int) = {
       val expStr = if (exp == 0) "" else s" [unstable release: $exp]"
       s"$min$expStr"
     }
-    val expectedMinorVersion = showMinorVersion(expected.minor, expected.experimental)
-    val foundMinorVersion = showMinorVersion(found.minor, found.experimental)
+    val minorVersion = showMinorVersion(MinorVersion, ExperimentalVersion)
+    val fileMinorVersion = showMinorVersion(fileMinor, fileExperimental)
     s"""TASTy signature has wrong version.
-      | expected: {majorVersion: ${expected.major}, minorVersion: $expectedMinorVersion}
-      | found   : {majorVersion: ${found.major}, minorVersion: $foundMinorVersion}
+      | expected: {majorVersion: $MajorVersion, minorVersion: $minorVersion}
+      | found   : {majorVersion: $fileMajor, minorVersion: $fileMinorVersion}
       |
       |""".stripMargin
   }