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DSlug avatar DSlug commented on June 22, 2024

Did a bit of digging to see if I could find a cause, ProfilingImpl contains this bit of code:

val treeSize = 0 // macroInfo.expandedNodes + guessTreeSize(expanded)

// Use 0L for the timer because it will be filled in by the caller `apply`
macroInfos.put(callSitePos, MacroInfo(expandedMacros, treeSize, 0L))
expanded

... But the timer never actually gets filled.

pluginsMacroExpand used to contain a function that updated the timers, but it got removed in 6000f5e:

def updateExpansionTime(desugared: Tree, start: statistics.TimerSnapshot): Unit = {
  statistics.stopTimer(preciseMacroTimer, start)
  val (nanos0, _) = start
  val timeNanos = (preciseMacroTimer.nanos - nanos0)
  val callSitePos = desugared.pos
  // Those that are not present failed to expand
  macroInfos.get(callSitePos).foreach { found =>
    val updatedInfo = found.copy(expansionNanos = timeNanos)
    macroInfos(callSitePos) = updatedInfo
  }
}

from scalac-profiling.

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