Add compilation unit info to ClassSymbol

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

@@ -1,21 +1,33 @@
 package dotty.tools.dotc.core
 
 import dotty.tools.io.AbstractFile
+import dotty.tools.tasty.TastyVersion
 
 /** Information about the compilation unit of a class symbol.
   *
   * @param associatedFile The source or class file from which this class or
   *                       the class containing this symbol was generated,
   *                       null if not applicable.
+  * @param tastyVersion   The TASTy version (major, minor, experimental)
   */
 class CompilationUnitInfo(
   val associatedFile: AbstractFile,
+  private var tastyVersionOpt: Option[TastyVersion],
 ) {
+
+  def tastyVersion: Option[TastyVersion] = tastyVersionOpt
+
+  /** Sets the TASTy version. Used to initialize the TASTy version when
+   *  Loading a TASTy file in TastyLoader.
+   */
+  def initTastyVersion(version: TastyVersion): Unit =
+    tastyVersionOpt = Some(version)
+
   override def toString(): String =
-    s"CompilationUnitInfo($associatedFile)"
+    s"CompilationUnitInfo($associatedFile, $tastyVersion)"
 }
 
 object CompilationUnitInfo:
   def apply(assocFile: AbstractFile | Null): CompilationUnitInfo | Null =
     if assocFile == null then null
-    else new CompilationUnitInfo(assocFile)
+    else new CompilationUnitInfo(assocFile, tastyVersionOpt = None) // TODO use current TASTy version

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

@@ -418,7 +418,12 @@ class ClassfileLoader(val classfile: AbstractFile) extends SymbolLoader {
 
 class TastyLoader(val tastyFile: AbstractFile) extends SymbolLoader {
 
-  def compilationUnitInfo: CompilationUnitInfo | Null = CompilationUnitInfo(tastyFile)
+  private val compUnitInfo = new CompilationUnitInfo(
+    tastyFile,
+    tastyVersionOpt = None // set on doComplete
+  )
+
+  def compilationUnitInfo: CompilationUnitInfo | Null = compUnitInfo
 
   def description(using Context): String = "TASTy file " + tastyFile.toString
 
@@ -427,6 +432,7 @@ class TastyLoader(val tastyFile: AbstractFile) extends SymbolLoader {
       val (classRoot, moduleRoot) = rootDenots(root.asClass)
       val tastyBytes = tastyFile.toByteArray
       val unpickler = new tasty.DottyUnpickler(tastyBytes)
+      compUnitInfo.initTastyVersion(unpickler.tastyVersion)
       unpickler.enter(roots = Set(classRoot, moduleRoot, moduleRoot.sourceModule))(using ctx.withSource(util.NoSource))
       if mayLoadTreesFromTasty then
         classRoot.classSymbol.rootTreeOrProvider = unpickler

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

@@ -14,6 +14,7 @@ import TreeUnpickler.UnpickleMode
 
 import dotty.tools.tasty.TastyReader
 import dotty.tools.tasty.TastyFormat.{ASTsSection, PositionsSection, CommentsSection, AttributesSection}
+import dotty.tools.tasty.TastyVersion
 
 object DottyUnpickler {
 
@@ -55,6 +56,13 @@ class DottyUnpickler(bytes: Array[Byte], mode: UnpickleMode = UnpickleMode.TopLe
   private val attributeUnpicklerOpt = unpickler.unpickle(new AttributesSectionUnpickler)
   private val treeUnpickler = unpickler.unpickle(treeSectionUnpickler(posUnpicklerOpt, commentUnpicklerOpt, attributeUnpicklerOpt)).get
 
+  def tastyVersion: TastyVersion =
+    TastyVersion(
+      unpickler.header.majorVersion,
+      unpickler.header.minorVersion,
+      unpickler.header.experimentalVersion,
+    )
+
   /** Enter all toplevel classes and objects into their scopes
    *  @param roots          a set of SymDenotations that should be overwritten by unpickling
    */

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

@@ -4,8 +4,7 @@ package tasty
 
 import scala.language.unsafeNulls
 
-import dotty.tools.tasty.{TastyFormat, TastyBuffer, TastyReader, TastyHeaderUnpickler, UnpicklerConfig}
-import TastyHeaderUnpickler.TastyVersion
+import dotty.tools.tasty.{TastyFormat, TastyVersion, TastyBuffer, TastyReader, TastyHeaderUnpickler, UnpicklerConfig}
 import TastyFormat.NameTags.*, TastyFormat.nameTagToString
 import TastyBuffer.NameRef
 
@@ -122,7 +121,7 @@ class TastyUnpickler(reader: TastyReader) {
     result
   }
 
-  new TastyHeaderUnpickler(scala3CompilerConfig, reader).readHeader()
+  val header = new TastyHeaderUnpickler(scala3CompilerConfig, reader).readFullHeader()
 
   locally {
     until(readEnd()) { nameAtRef.add(readNameContents()) }

compiler/test/dotty/tools/dotc/core/tasty/TastyHeaderUnpicklerTest.scala

@@ -9,7 +9,7 @@ import dotty.tools.tasty.TastyBuffer
 import dotty.tools.tasty.TastyReader
 import dotty.tools.tasty.UnpickleException
 import dotty.tools.tasty.TastyHeaderUnpickler
-import dotty.tools.tasty.TastyHeaderUnpickler.TastyVersion
+import dotty.tools.tasty.TastyVersion
 import dotty.tools.tasty.UnpicklerConfig
 
 class TastyHeaderUnpicklerTest {

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

@@ -3,7 +3,6 @@ package dotty.tools.tasty
 import java.util.UUID
 
 import TastyFormat.{MajorVersion, MinorVersion, ExperimentalVersion, header}
-import TastyHeaderUnpickler.TastyVersion
 
 /**
  * The Tasty Header consists of four fields:
@@ -214,27 +213,4 @@ object TastyHeaderUnpickler {
         BackwardIncompatibleExperimental
       else ForwardIncompatible
   }
-
-  case class TastyVersion(major: Int, minor: Int, experimental: Int) {
-    def isExperimental: Boolean = experimental > 0
-
-    def nextStable: TastyVersion = copy(experimental = 0)
-
-    def minStable: TastyVersion = copy(minor = 0, experimental = 0)
-
-    def show: String = {
-      val suffix = if (isExperimental) s"-experimental-$experimental" else ""
-      s"$major.$minor$suffix"
-    }
-
-    def kind: String =
-      if (isExperimental) "experimental TASTy" else "TASTy"
-
-    def validRange: String = {
-      val min = TastyVersion(major, 0, 0)
-      val max = if (experimental == 0) this else TastyVersion(major, minor - 1, 0)
-      val extra = Option.when(experimental > 0)(this)
-      s"stable TASTy from ${min.show} to ${max.show}${extra.fold("")(e => s", or exactly ${e.show}")}"
-    }
-  }
 }

tasty/src/dotty/tools/tasty/TastyVersion.scala

@@ -0,0 +1,24 @@
+package dotty.tools.tasty
+
+case class TastyVersion(major: Int, minor: Int, experimental: Int) {
+  def isExperimental: Boolean = experimental > 0
+
+  def nextStable: TastyVersion = copy(experimental = 0)
+
+  def minStable: TastyVersion = copy(minor = 0, experimental = 0)
+
+  def show: String = {
+    val suffix = if (isExperimental) s"-experimental-$experimental" else ""
+    s"$major.$minor$suffix"
+  }
+
+  def kind: String =
+    if (isExperimental) "experimental TASTy" else "TASTy"
+
+  def validRange: String = {
+    val min = TastyVersion(major, 0, 0)
+    val max = if (experimental == 0) this else TastyVersion(major, minor - 1, 0)
+    val extra = Option.when(experimental > 0)(this)
+    s"stable TASTy from ${min.show} to ${max.show}${extra.fold("")(e => s", or exactly ${e.show}")}"
+  }
+}