Merge pull request #3519 from dotty-staging/dotp-tasty

Add -print-tasty setting

Author: nicolasstucki

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

@@ -43,6 +43,7 @@ class ScalaSettings extends Settings.SettingGroup {
   val rewrite = OptionSetting[Rewrites]("-rewrite", "When used in conjunction with -language:Scala2 rewrites sources to migrate to new syntax")
   val silentWarnings = BooleanSetting("-nowarn", "Silence all warnings.")
   val fromTasty = BooleanSetting("-from-tasty", "Compile classes from tasty in classpath. The arguments are used as class names.")
+  val printTasty = BooleanSetting("-print-tasty", "Prints the raw tasty when decompiling.")
 
   /** -X "Advanced" settings
    */

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

@@ -29,6 +29,7 @@ class TastyPrinter(bytes: Array[Byte])(implicit ctx: Context) {
   def printContents(): Unit = {
     println("Names:")
     printNames()
+    println()
     println("Trees:")
     unpickle(new TreeSectionUnpickler)
     unpickle(new PositionSectionUnpickler)
@@ -111,7 +112,7 @@ class TastyPrinter(bytes: Array[Byte])(implicit ctx: Context) {
       val positions = new PositionUnpickler(reader).positions
       println(s" position bytes:")
       val sorted = positions.toSeq.sortBy(_._1.index)
-      for ((addr, pos) <- sorted) println(s"${addr.index}: ${offsetToInt(pos.start)} .. ${pos.end}")
+      for ((addr, pos) <- sorted) println(s"       ${addr.index}: ${offsetToInt(pos.start)} .. ${pos.end}")
     }
   }
 }

compiler/src/dotty/tools/dotc/decompiler/DecompilationPrinter.scala

@@ -3,6 +3,7 @@ package decompiler
 
 import dotty.tools.dotc.core.Contexts._
 import dotty.tools.dotc.core.Phases.Phase
+import dotty.tools.dotc.core.tasty.TastyPrinter
 
 /** Phase that prints the trees in all loaded compilation units.
  *
@@ -26,5 +27,10 @@ class DecompilationPrinter extends Phase {
 
     println(unit.tpdTree.show)
     println(line)
+
+    if (ctx.settings.printTasty.value) {
+      new TastyPrinter(unit.pickled.head._2).printContents()
+      println(line)
+    }
   }
 }