Make standard section names part of TastyFormat

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

@@ -6,12 +6,13 @@ import dotty.tools.dotc.core.Contexts._
 
 import dotty.tools.tasty.TastyBuffer
 import TastyBuffer.{Addr, NoAddr}
+import dotty.tools.tasty.TastyFormat.CommentsSection
 
 import java.nio.charset.StandardCharsets
 
 class CommentPickler(pickler: TastyPickler, addrOfTree: tpd.Tree => Addr, docString: untpd.MemberDef => Option[Comment]):
   private val buf = new TastyBuffer(5000)
-  pickler.newSection("Comments", buf)
+  pickler.newSection(CommentsSection, buf)
 
   def pickleComment(root: tpd.Tree): Unit = traverse(root)
 

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

@@ -11,24 +11,25 @@ import Names.SimpleName
 import TreeUnpickler.UnpickleMode
 
 import dotty.tools.tasty.TastyReader
+import dotty.tools.tasty.TastyFormat.{ASTsSection, PositionsSection, CommentsSection}
 
 object DottyUnpickler {
 
   /** Exception thrown if classfile is corrupted */
   class BadSignature(msg: String) extends RuntimeException(msg)
 
   class TreeSectionUnpickler(posUnpickler: Option[PositionUnpickler], commentUnpickler: Option[CommentUnpickler])
-  extends SectionUnpickler[TreeUnpickler](TreePickler.sectionName) {
+  extends SectionUnpickler[TreeUnpickler](ASTsSection) {
     def unpickle(reader: TastyReader, nameAtRef: NameTable): TreeUnpickler =
       new TreeUnpickler(reader, nameAtRef, posUnpickler, commentUnpickler)
   }
 
-  class PositionsSectionUnpickler extends SectionUnpickler[PositionUnpickler]("Positions") {
+  class PositionsSectionUnpickler extends SectionUnpickler[PositionUnpickler](PositionsSection) {
     def unpickle(reader: TastyReader, nameAtRef: NameTable): PositionUnpickler =
       new PositionUnpickler(reader, nameAtRef)
   }
 
-  class CommentsSectionUnpickler extends SectionUnpickler[CommentUnpickler]("Comments") {
+  class CommentsSectionUnpickler extends SectionUnpickler[CommentUnpickler](CommentsSection) {
     def unpickle(reader: TastyReader, nameAtRef: NameTable): CommentUnpickler =
       new CommentUnpickler(reader)
   }

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

@@ -3,7 +3,7 @@ package dotc
 package core
 package tasty
 
-import dotty.tools.tasty.TastyFormat.SOURCE
+import dotty.tools.tasty.TastyFormat.{SOURCE, PositionsSection}
 import dotty.tools.tasty.TastyBuffer
 import TastyBuffer._
 
@@ -23,7 +23,7 @@ class PositionPickler(
 
   import ast.tpd._
   val buf: TastyBuffer = new TastyBuffer(5000)
-  pickler.newSection("Positions", buf)
+  pickler.newSection(PositionsSection, buf)
 
   private val pickledIndices = new mutable.BitSet
 

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

@@ -11,6 +11,7 @@ import StdNames.nme
 import TastyUnpickler._
 import util.Spans.offsetToInt
 import printing.Highlighting._
+import dotty.tools.tasty.TastyFormat.ASTsSection
 
 /** Reads the package and class name of the class contained in this TASTy */
 class TastyClassName(bytes: Array[Byte]) {
@@ -21,7 +22,7 @@ class TastyClassName(bytes: Array[Byte]) {
   /** Returns a tuple with the package and class names */
   def readName(): Option[(TermName, TermName)] = unpickle(new TreeSectionUnpickler)
 
-  class TreeSectionUnpickler extends SectionUnpickler[(TermName, TermName)](TreePickler.sectionName) {
+  class TreeSectionUnpickler extends SectionUnpickler[(TermName, TermName)](ASTsSection) {
     import dotty.tools.tasty.TastyFormat._
     def unpickle(reader: TastyReader, tastyName: NameTable): (TermName, TermName) = {
       import reader._

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

@@ -10,6 +10,7 @@ import Names.Name
 import TastyUnpickler._
 import util.Spans.offsetToInt
 import printing.Highlighting._
+import dotty.tools.tasty.TastyFormat.{ASTsSection, PositionsSection, CommentsSection}
 
 object TastyPrinter:
   def show(bytes: Array[Byte])(using Context): String =
@@ -57,7 +58,7 @@ class TastyPrinter(bytes: Array[Byte]) {
     sb.result
   }
 
-  class TreeSectionUnpickler extends SectionUnpickler[String](TreePickler.sectionName) {
+  class TreeSectionUnpickler extends SectionUnpickler[String](ASTsSection) {
     import dotty.tools.tasty.TastyFormat._
 
     private val sb: StringBuilder = new StringBuilder
@@ -133,7 +134,7 @@ class TastyPrinter(bytes: Array[Byte]) {
     }
   }
 
-  class PositionSectionUnpickler extends SectionUnpickler[String]("Positions") {
+  class PositionSectionUnpickler extends SectionUnpickler[String](PositionsSection) {
 
     private val sb: StringBuilder = new StringBuilder
 
@@ -150,7 +151,7 @@ class TastyPrinter(bytes: Array[Byte]) {
     }
   }
 
-  class CommentSectionUnpickler extends SectionUnpickler[String]("Comments") {
+  class CommentSectionUnpickler extends SectionUnpickler[String](CommentsSection) {
 
     private val sb: StringBuilder = new StringBuilder
 

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

@@ -20,11 +20,10 @@ import printing.Texts._
 import util.SourceFile
 import annotation.constructorOnly
 import collection.mutable
+import dotty.tools.tasty.TastyFormat.ASTsSection
 
 object TreePickler {
 
-  val sectionName = "ASTs"
-
   case class Hole(isTermHole: Boolean, idx: Int, args: List[tpd.Tree])(implicit @constructorOnly src: SourceFile) extends tpd.Tree {
     override def isTerm: Boolean = isTermHole
     override def isType: Boolean = !isTermHole
@@ -36,7 +35,7 @@ object TreePickler {
 
 class TreePickler(pickler: TastyPickler) {
   val buf: TreeBuffer = new TreeBuffer
-  pickler.newSection(TreePickler.sectionName, buf)
+  pickler.newSection(ASTsSection, buf)
   import TreePickler._
   import buf._
   import pickler.nameBuffer.nameIndex

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

@@ -226,7 +226,7 @@ Note: Tree tags are grouped into 5 categories that determine what follows, and t
   Category 4 (tags 110-127):  tag Nat AST
   Category 5 (tags 128-255):  tag Length <payload>
 
-Standard Section: "Positions" Assoc*
+Standard-Section: "Positions" Assoc*
 
   Assoc         = Header offset_Delta? offset_Delta? point_Delta?
                 | SOURCE nameref_Int
@@ -244,7 +244,7 @@ Standard Section: "Positions" Assoc*
 
 All elements of a position section are serialized as Ints
 
-Standard Section: "Comments" Comment*
+Standard-Section: "Comments" Comment*
 
   Comment       = Length Bytes LongInt      // Raw comment's bytes encoded as UTF-8, followed by the comment's coordinates.
 
@@ -257,6 +257,10 @@ object TastyFormat {
   val MajorVersion: Int = 25
   val MinorVersion: Int = 0
 
+  final val ASTsSection = "ASTs"
+  final val PositionsSection = "Positions"
+  final val CommentsSection = "Comments"
+
   /** Tags used to serialize names, should update [[nameTagToString]] if a new constant is added */
   class NameTags {
     final val UTF8 = 1               // A simple name in UTF8 encoding.