Output specified tasty version

Author: Kordyjan

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

@@ -38,6 +38,7 @@ import xsbti.AnalysisCallback
 import plugins._
 import java.util.concurrent.atomic.AtomicInteger
 import java.nio.file.InvalidPathException
+import dotty.tools.tasty.TastyFormat
 
 object Contexts {
 
@@ -480,7 +481,14 @@ object Contexts {
 
     /** A new context that summarizes an import statement */
     def importContext(imp: Import[?], sym: Symbol): FreshContext =
-       fresh.setImportInfo(ImportInfo(sym, imp.selectors, imp.expr))
+      fresh.setImportInfo(ImportInfo(sym, imp.selectors, imp.expr))
+
+    def tastyVersion: (Int, Int, Int) =
+      base.settings.scalaRelease.value match
+        case "" =>
+          import TastyFormat.*
+          (MajorVersion, MinorVersion, ExperimentalVersion)
+        case s"$maj.$min" => (maj.toInt + 25, min.toInt, 0)
 
     /** Is the debug option set? */
     def debug: Boolean = base.settings.Ydebug.value

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

@@ -7,6 +7,8 @@ import dotty.tools.tasty.{TastyBuffer, TastyFormat, TastyHash}
 import TastyFormat._
 import TastyBuffer._
 
+import Contexts._
+
 import collection.mutable
 import core.Symbols.{Symbol, ClassSymbol}
 import ast.tpd
@@ -30,10 +32,12 @@ class TastyPickler(val rootCls: ClassSymbol) {
   def newSection(name: String, buf: TastyBuffer): Unit =
     sections += ((nameBuffer.nameIndex(name.toTermName), buf))
 
-  def assembleParts(): Array[Byte] = {
+  def assembleParts()(using Context): Array[Byte] = {
     def lengthWithLength(buf: TastyBuffer) =
       buf.length + natSize(buf.length)
 
+    val (majorVersion, minorVersion, experimentalVersion) = ctx.tastyVersion
+
     nameBuffer.assemble()
     sections.foreach(_._2.assemble())
 
@@ -48,9 +52,9 @@ class TastyPickler(val rootCls: ClassSymbol) {
     val headerBuffer = {
       val buf = new TastyBuffer(header.length + TastyPickler.versionStringBytes.length + 32)
       for (ch <- header) buf.writeByte(ch.toByte)
-      buf.writeNat(MajorVersion)
-      buf.writeNat(MinorVersion)
-      buf.writeNat(ExperimentalVersion)
+      buf.writeNat(majorVersion)
+      buf.writeNat(minorVersion)
+      buf.writeNat(experimentalVersion)
       buf.writeNat(TastyPickler.versionStringBytes.length)
       buf.writeBytes(TastyPickler.versionStringBytes, TastyPickler.versionStringBytes.length)
       buf.writeUncompressedLong(uuidLow)