scala.scalanative.nir.serialization.PositionFormat.scala Maven / Gradle / Ivy

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package scala.scalanative.nir.serialization

// Ported from Scala.js

private[serialization] object PositionFormat {
  /* Positions are serialized incrementally as diffs wrt the last position.
   *
   * Formats are (the first byte is decomposed in bits):
   *
   *   1st byte | next bytes |  description
   *  -----------------------------------------
   *   ccccccc0 |            | Column diff (7-bit signed)
   *   llllll01 | CC         | Line diff (6-bit signed), column (8-bit unsigned)
   *   ____0011 | LL LL CC   | Line diff (16-bit signed), column (8-bit unsigned)
   *   ____0111 | 12 bytes   | File index, line, column (all 32-bit signed)
   *   11111111 |            | NoPosition (is not compared/stored in last position)
   *
   * Underscores are irrelevant and must be set to 0.
   */

  final val Format1Mask = 0x01
  final val Format1MaskValue = 0x00
  final val Format1Shift = 1

  final val Format2Mask = 0x03
  final val Format2MaskValue = 0x01
  final val Format2Shift = 2

  final val Format3Mask = 0x0f
  final val Format3MaskValue = 0x03

  final val FormatFullMask = 0x0f
  final val FormatFullMaskValue = 0x7

  final val FormatNoPositionValue = -1
}