Improve Source Positions

compiler/src/dotty/tools/backend/jvm/CollectEntryPoints.scala

@@ -12,7 +12,7 @@ import SymDenotations._
 import Contexts._
 import Types._
 import Symbols._
-import dotty.tools.dotc.util.Positions.Position
+import dotty.tools.dotc.util.SourcePosition
 import Decorators._
 import StdNames.nme
 
@@ -47,10 +47,10 @@ object CollectEntryPoints{
     def hasJavaMainMethod(sym: Symbol): Boolean =
       (toDenot(sym).info member nme.main).alternatives exists(x => isJavaMainMethod(x.symbol))
 
-    def fail(msg: String, pos: Position = sym.pos) = {
-      ctx.warning(          sym.name +
-        s" has a main method with parameter type Array[String], but ${toDenot(sym).fullName} will not be a runnable program.\n  Reason: $msg",
-        sourcePos(sym.pos)
+    def fail(msg: String, pos: SourcePosition = sym.sourcePos) = {
+      ctx.warning(
+        i"""${sym.name} has a main method with parameter type Array[String], but ${sym.fullName} will not be a runnable program.
+           |Reason: $msg""", sym.sourcePos
         // TODO: make this next claim true, if possible
         //   by generating valid main methods as static in module classes
         //   not sure what the jvm allows here
@@ -92,11 +92,11 @@ object CollectEntryPoints{
                 fail("main methods cannot be generic.")
               case MethodTpe(paramNames, paramTypes, resultType) =>
                 if (resultType :: paramTypes exists (_.typeSymbol.isAbstractType))
-                  fail("main methods cannot refer to type parameters or abstract types.", m.symbol.pos)
+                  fail("main methods cannot refer to type parameters or abstract types.", m.symbol.sourcePos)
                 else
-                  isJavaMainMethod(m.symbol) || fail("main method must have exact signature (Array[String])Unit", m.symbol.pos)
+                  isJavaMainMethod(m.symbol) || fail("main method must have exact signature (Array[String])Unit", m.symbol.sourcePos)
               case tp =>
-                fail(s"don't know what this is: $tp", m.symbol.pos)
+                fail(s"don't know what this is: $tp", m.symbol.sourcePos)
             }
           }
         }

compiler/src/dotty/tools/backend/jvm/DottyBackendInterface.scala

@@ -21,7 +21,8 @@ import Types._
 import Symbols._
 import Phases._
 
-import dotty.tools.dotc.util.Positions
+import dotty.tools.dotc.util
+import dotty.tools.dotc.util.Spans
 import Decorators._
 import tpd._
 
@@ -41,7 +42,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
   type CompilationUnit = dotc.CompilationUnit
   type Constant        = Constants.Constant
   type Literal         = tpd.Literal
-  type Position        = Positions.Position
+  type Position        = Spans.Span
   type Name            = Names.Name
   type ClassDef        = tpd.TypeDef
   type TypeDef         = tpd.TypeDef
@@ -77,7 +78,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
   type Closure         = tpd.Closure
 
   val NoSymbol: Symbol = Symbols.NoSymbol
-  val NoPosition: Position = Positions.NoPosition
+  val NoPosition: Position = Spans.NoSpan
   val EmptyTree: Tree = tpd.EmptyTree
 
 
@@ -380,16 +381,17 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
     ctx.requiredModule(className)
   }
 
-
   def debuglog(msg: => String): Unit = ctx.debuglog(msg)
   def informProgress(msg: String): Unit = ctx.informProgress(msg)
   def log(msg: => String): Unit = ctx.log(msg)
-  def error(pos: Position, msg: String): Unit = ctx.error(msg, pos)
-  def warning(pos: Position, msg: String): Unit = ctx.warning(msg, pos)
+  def error(pos: Position, msg: String): Unit = ctx.error(msg, sourcePos(pos))
+  def warning(pos: Position, msg: String): Unit = ctx.warning(msg, sourcePos(pos))
   def abort(msg: String): Nothing = {
     ctx.error(msg)
     throw new RuntimeException(msg)
   }
+  def sourcePos(pos: Position)(implicit ctx: Context): util.SourcePosition =
+    ctx.source.atSpan(pos)
 
   def emitAsmp: Option[String] = None
 
@@ -502,7 +504,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
         i"""|compiler bug: created invalid generic signature for $sym in ${sym.denot.owner.showFullName}
             |signature: $sig
             |if this is reproducible, please report bug at https://github.com/lampepfl/dotty/issues
-        """.trim, sym.pos)
+        """.trim, sym.sourcePos)
     }
   }
 
@@ -587,7 +589,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
   implicit def treeHelper(a: Tree): TreeHelper = new TreeHelper {
     def symbol: Symbol = a.symbol
 
-    def pos: Position = a.pos
+    def pos: Position = a.span
 
     def isEmpty: Boolean = a.isEmpty
 
@@ -809,7 +811,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
 
     def moduleSuffix: String = "" // todo: validate that names already have $ suffix
     def outputDirectory: AbstractFile = DottyBackendInterface.this.outputDirectory
-    def pos: Position = sym.pos
+    def pos: Position = sym.span
 
     def throwsAnnotations: List[Symbol] = Nil
 
@@ -1105,7 +1107,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
     def _1: Type = field.tpe match {
       case JavaArrayType(elem) => elem
       case _ =>
-        ctx.error(s"JavaSeqArray with type ${field.tpe} reached backend: $field", field.pos)
+        error(field.span, s"JavaSeqArray with type ${field.tpe} reached backend: $field")
         UnspecifiedErrorType
     }
     def _2: List[Tree] = field.elems

compiler/src/dotty/tools/backend/jvm/GenBCode.scala

@@ -163,7 +163,7 @@ class GenBCodePipeline(val entryPoints: List[Symbol], val int: DottyBackendInter
               else (dupClassSym, classSymbol)
             ctx.atPhase(ctx.typerPhase) { implicit ctx =>
               ctx.warning(s"${cl1.show} differs only in case from ${cl2.showLocated}. " +
-                "Such classes will overwrite one another on case-insensitive filesystems.", cl1.pos)
+                "Such classes will overwrite one another on case-insensitive filesystems.", cl1.sourcePos)
             }
         }
       }