Move compiler and compiler tests to compiler dir

1 files changed, 39 insertions, 0 deletions

diff --git a/compiler/src/dotty/tools/dotc/core/tasty/PositionUnpickler.scala b/compiler/src/dotty/tools/dotc/core/tasty/PositionUnpickler.scala
new file mode 100644
index 000000000..cbe213d89
--- /dev/null
+++ b/compiler/src/dotty/tools/dotc/core/tasty/PositionUnpickler.scala
@@ -0,0 +1,39 @@
+package dotty.tools
+package dotc
+package core
+package tasty
+
+
+import util.Positions._
+import collection.mutable
+import TastyBuffer.{Addr, NoAddr}
+
+/** Unpickler for tree positions */
+class PositionUnpickler(reader: TastyReader) {
+  import reader._
+
+  private[tasty] lazy val positions = {
+    val positions = new mutable.HashMap[Addr, Position]
+    var curIndex = 0
+    var curStart = 0
+    var curEnd = 0
+    while (!isAtEnd) {
+      val header = readInt()
+      val addrDelta = header >> 3
+      val hasStart = (header & 4) != 0
+      val hasEnd = (header & 2) != 0
+      val hasPoint = (header & 1) != 0
+      curIndex += addrDelta
+      assert(curIndex >= 0)
+      if (hasStart) curStart += readInt()
+      if (hasEnd) curEnd += readInt()
+      positions(Addr(curIndex)) = 
+        if (hasPoint) Position(curStart, curEnd, curStart + readInt())
+        else Position(curStart, curEnd)
+    }
+    positions
+  }
+
+  def posAt(addr: Addr) = positions.getOrElse(addr, NoPosition)
+}
+