From a4fc7746563423934d33d234b5f68ecb4cd3a2bb Mon Sep 17 00:00:00 2001
From: Nicolas Stucki <nicolas.stucki@gmail.com>
Date: Tue, 21 Nov 2023 15:38:51 +0100
Subject: [PATCH] Simplify `TastyHeader`

---
 .../dotty/tools/dotc/core/SymbolLoaders.scala | 10 ++------
 .../tools/tasty/TastyHeaderUnpickler.scala    | 23 +++++++++----------
 2 files changed, 13 insertions(+), 20 deletions(-)

diff --git a/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala b/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala
index c5a88b45aa55..196362748a75 100644
--- a/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala
+++ b/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala
@@ -426,14 +426,8 @@ class TastyLoader(val tastyFile: AbstractFile) extends SymbolLoader {
     val tastyHeader = unpickler.unpickler.header
     new CompilationUnitInfo(
       tastyFile,
-      tastyVersion = Some(
-        TastyVersion(
-          tastyHeader.majorVersion,
-          tastyHeader.minorVersion,
-          tastyHeader.experimentalVersion,
-        )
-      )
-  )
+      tastyVersion = Some(tastyHeader.version),
+    )
 
   def description(using Context): String = "TASTy file " + tastyFile.toString
 
diff --git a/tasty/src/dotty/tools/tasty/TastyHeaderUnpickler.scala b/tasty/src/dotty/tools/tasty/TastyHeaderUnpickler.scala
index a51541192321..aa3867e1b029 100644
--- a/tasty/src/dotty/tools/tasty/TastyHeaderUnpickler.scala
+++ b/tasty/src/dotty/tools/tasty/TastyHeaderUnpickler.scala
@@ -8,22 +8,21 @@ import TastyFormat.{MajorVersion, MinorVersion, ExperimentalVersion, header}
  * The Tasty Header consists of four fields:
  * - uuid
  *   - contains a hash of the sections of the TASTy file
- * - majorVersion
- *   - matching the TASTy format version that last broke backwards compatibility
- * - minorVersion
- *   - matching the TASTy format version that last broke forward compatibility
- * - experimentalVersion
- *   - 0 for final compiler version
- *   - positive for between minor versions and forward compatibility
- *     is broken since the previous stable version.
+ * - version
+ *   - majorVersion
+ *     - matching the TASTy format version that last broke backwards compatibility
+ *   - minorVersion
+ *     - matching the TASTy format version that last broke forward compatibility
+ *   - experimentalVersion
+ *     - 0 for final compiler version
+ *     - positive for between minor versions and forward compatibility
+ *       is broken since the previous stable version.
  * - toolingVersion
  *   - arbitrary string representing the tooling that produced the TASTy
  */
 sealed abstract case class TastyHeader(
   uuid: UUID,
-  majorVersion: Int,
-  minorVersion: Int,
-  experimentalVersion: Int,
+  version: TastyVersion,
   toolingVersion: String
 )
 
@@ -156,7 +155,7 @@ class TastyHeaderUnpickler(config: UnpicklerConfig, reader: TastyReader) {
       })
 
       val uuid = new UUID(readUncompressedLong(), readUncompressedLong())
-      new TastyHeader(uuid, fileMajor, fileMinor, fileExperimental, toolingVersion) {}
+      new TastyHeader(uuid, TastyVersion(fileMajor, fileMinor, fileExperimental), toolingVersion) {}
     }
   }