Add SemanticDB extractor

NOTICE.md

@@ -0,0 +1,209 @@
+# License notice for the ScalaPB protobuf library
+
+The Dotty codebase contains parts which are derived from
+[the ScalaPB protobuf library](https://github.com/scalapb/scalapb).
+We include the text of the original license below:
+
+```
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+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
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+```

compiler/src/dotty/tools/dotc/Compiler.scala

@@ -40,6 +40,7 @@ class Compiler {
     List(new YCheckPositions) ::    // YCheck positions
     List(new Staging) ::            // Check PCP, heal quoted types and expand macros
     List(new sbt.ExtractDependencies) :: // Sends information on classes' dependencies to sbt via callbacks
+    List(new semanticdb.ExtractSemanticDB) :: // Extract info into .semanticdb files
     List(new PostTyper) ::          // Additional checks and cleanups after type checking
     List(new sbt.ExtractAPI) ::     // Sends a representation of the API of classes to sbt via callbacks
     List(new SetRootTree) ::        // Set the `rootTreeOrProvider` on class symbols

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -332,53 +332,44 @@ object Trees {
     def namedType: NamedType = tpe.asInstanceOf[NamedType]
   }
 
-  /** Tree defines a new symbol and carries modifiers.
-   *  The position of a MemberDef contains only the defined identifier or pattern.
-   *  The envelope of a MemberDef contains the whole definition and has its point
-   *  on the opening keyword (or the next token after that if keyword is missing).
-   */
-  abstract class MemberDef[-T >: Untyped](implicit @constructorOnly src: SourceFile) extends NameTree[T] with DefTree[T] {
-    type ThisTree[-T >: Untyped] <: MemberDef[T]
-
-    def rawComment: Option[Comment] = getAttachment(DocComment)
-
-    def setComment(comment: Option[Comment]): this.type = {
-      comment.map(putAttachment(DocComment, _))
-      this
-    }
+  abstract class NamedDefTree[-T >: Untyped](implicit @constructorOnly src: SourceFile) extends NameTree[T] with DefTree[T] {
+    type ThisTree[-T >: Untyped] <: NamedDefTree[T]
 
     /** The position of the name defined by this definition.
      *  This is a point position if the definition is synthetic, or a range position
      *  if the definition comes from source.
      *  It might also be that the definition does not have a position (for instance when synthesized by
      *  a calling chain from `viewExists`), in that case the return position is NoSpan.
+     *  Overridden in Bind
      */
     def nameSpan: Span =
       if (span.exists) {
         val point = span.point
         if (rawMods.is(Synthetic) || name.toTermName == nme.ERROR) Span(point)
         else {
           val realName = name.stripModuleClassSuffix.lastPart.toString
-          val nameStart =
-            if (point != span.start) point
-            else {
-              // Point might be too far away from start to be recorded. In this case we fall back to scanning
-              // forwards from the start offset for the name.
-              // Note: This might be inaccurate since scanning might hit accidentally the same
-              // name (e.g. in a comment) before finding the real definition.
-              // To make this behavior more robust we'd have to change the trees for definitions to contain
-              // a fully positioned Ident in place of a name.
-              val contents = if source.exists then source.content() else Array.empty[Char]
-              val idx = contents.indexOfSlice(realName, point)
-              if (idx >= 0) idx
-              else point // use `point` anyway. This is important if no source exists so scanning fails
-            }
           Span(point, point + realName.length, point)
         }
       }
       else span
   }
 
+  /** Tree defines a new symbol and carries modifiers.
+   *  The position of a MemberDef contains only the defined identifier or pattern.
+   *  The envelope of a MemberDef contains the whole definition and has its point
+   *  on the opening keyword (or the next token after that if keyword is missing).
+   */
+  abstract class MemberDef[-T >: Untyped](implicit @constructorOnly src: SourceFile) extends NamedDefTree[T] {
+    type ThisTree[-T >: Untyped] <: MemberDef[T]
+
+    def rawComment: Option[Comment] = getAttachment(DocComment)
+
+    def setComment(comment: Option[Comment]): this.type = {
+      comment.map(putAttachment(DocComment, _))
+      this
+    }
+  }
+
   /** A ValDef or DefDef tree */
   abstract class ValOrDefDef[-T >: Untyped](implicit @constructorOnly src: SourceFile) extends MemberDef[T] with WithLazyField[Tree[T]] {
     type ThisTree[-T >: Untyped] <: ValOrDefDef[T]
@@ -705,10 +696,13 @@ object Trees {
 
   /** name @ body */
   case class Bind[-T >: Untyped] private[ast] (name: Name, body: Tree[T])(implicit @constructorOnly src: SourceFile)
-    extends NameTree[T] with DefTree[T] with PatternTree[T] {
+    extends NamedDefTree[T] with PatternTree[T] {
     type ThisTree[-T >: Untyped] = Bind[T]
     override def isType: Boolean = name.isTypeName
     override def isTerm: Boolean = name.isTermName
+
+    override def nameSpan: Span =
+      if span.exists then Span(span.start, span.start + name.toString.length) else span
   }
 
   /** tree_1 | ... | tree_n */
@@ -938,6 +932,7 @@ object Trees {
     type NameTree = Trees.NameTree[T]
     type RefTree = Trees.RefTree[T]
     type DefTree = Trees.DefTree[T]
+    type NamedDefTree = Trees.NamedDefTree[T]
     type MemberDef = Trees.MemberDef[T]
     type ValOrDefDef = Trees.ValOrDefDef[T]
     type LazyTree = Trees.LazyTree[T]
@@ -1439,13 +1434,13 @@ object Trees {
               this(x, trees)
             case UnApply(fun, implicits, patterns) =>
               this(this(this(x, fun), implicits), patterns)
-            case tree @ ValDef(name, tpt, _) =>
+            case tree @ ValDef(_, tpt, _) =>
               implicit val ctx = localCtx
               this(this(x, tpt), tree.rhs)
-            case tree @ DefDef(name, tparams, vparamss, tpt, _) =>
+            case tree @ DefDef(_, tparams, vparamss, tpt, _) =>
               implicit val ctx = localCtx
               this(this(vparamss.foldLeft(this(x, tparams))(apply), tpt), tree.rhs)
-            case TypeDef(name, rhs) =>
+            case TypeDef(_, rhs) =>
               implicit val ctx = localCtx
               this(x, rhs)
             case tree @ Template(constr, parents, self, _) if tree.derived.isEmpty =>

compiler/src/dotty/tools/dotc/ast/untpd.scala

@@ -111,6 +111,7 @@ object untpd extends Trees.Instance[Untyped] with UntypedTreeInfo {
   case class Export(expr: Tree, selectors: List[ImportSelector])(implicit @constructorOnly src: SourceFile) extends Tree
 
   case class ImportSelector(imported: Ident, renamed: Tree = EmptyTree, bound: Tree = EmptyTree)(implicit @constructorOnly src: SourceFile) extends Tree {
+    // TODO: Make bound a typed tree?
 
     /** It's a `given` selector */
     val isGiven: Boolean = imported.name.isEmpty

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

@@ -17,6 +17,8 @@ class ScalaSettings extends Settings.SettingGroup {
   val javabootclasspath: Setting[String] = PathSetting("-javabootclasspath", "Override java boot classpath.", Defaults.javaBootClassPath) withAbbreviation "--java-boot-class-path"
   val javaextdirs: Setting[String] = PathSetting("-javaextdirs", "Override java extdirs classpath.", Defaults.javaExtDirs) withAbbreviation "--java-extension-directories"
   val sourcepath: Setting[String] = PathSetting("-sourcepath", "Specify location(s) of source files.", Defaults.scalaSourcePath) withAbbreviation "--source-path"
+  val sourceroot: Setting[String] = PathSetting("-sourceroot", "Specify workspace root directory", ".")
+  val semanticdbTarget: Setting[String] = PathSetting("-semanticdb-target", "Specify an alternative output directory for SemanticDB files", "")
 
   val classpath: Setting[String] = PathSetting("-classpath", "Specify where to find user class files.", defaultClasspath) withAbbreviation "-cp" withAbbreviation "--class-path"
   val outputDir: Setting[AbstractFile] = OutputSetting("-d", "directory|jar", "destination for generated classfiles.",
@@ -150,6 +152,7 @@ class ScalaSettings extends Settings.SettingGroup {
   val YdumpSbtInc: Setting[Boolean] = BooleanSetting("-Ydump-sbt-inc", "For every compiled foo.scala, output the API representation and dependencies used for sbt incremental compilation in foo.inc, implies -Yforce-sbt-phases.")
   val YcheckAllPatmat: Setting[Boolean] = BooleanSetting("-Ycheck-all-patmat", "Check exhaustivity and redundancy of all pattern matching (used for testing the algorithm)")
   val YretainTrees: Setting[Boolean] = BooleanSetting("-Yretain-trees", "Retain trees for top-level classes, accessible from ClassSymbol#tree")
+  val Ysemanticdb: Setting[Boolean] = BooleanSetting("-Ysemanticdb", "Store information in SemanticDB")
   val YshowTreeIds: Setting[Boolean] = BooleanSetting("-Yshow-tree-ids", "Uniquely tag all tree nodes in debugging output.")
 
   val YprofileEnabled: Setting[Boolean] = BooleanSetting("-Yprofile-enabled", "Enable profiling.")