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Add debug help to find out what's compiling #22522

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Add debug help to find out what's compiling #22522

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23 changes: 22 additions & 1 deletion compiler/src/dotty/tools/dotc/Run.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ import Run.Progress
import scala.compiletime.uninitialized
import dotty.tools.dotc.transform.MegaPhase
import dotty.tools.dotc.transform.Pickler.AsyncTastyHolder
import java.util.{Timer, TimerTask}

/** A compiler run. Exports various methods to compile source files */
class Run(comp: Compiler, ictx: Context) extends ImplicitRunInfo with ConstraintRunInfo {
Expand Down Expand Up @@ -382,7 +383,7 @@ class Run(comp: Compiler, ictx: Context) extends ImplicitRunInfo with Constraint
initializeAsyncTasty()
else () => {}

runPhases(allPhases = fusedPhases)(using runCtx)
showProgress(runPhases(allPhases = fusedPhases)(using runCtx))
cancelAsyncTasty()

ctx.reporter.finalizeReporting()
Expand Down Expand Up @@ -433,6 +434,26 @@ class Run(comp: Compiler, ictx: Context) extends ImplicitRunInfo with Constraint
process()(using unitCtx)
}

/** If set to true, prints every 10 seconds the files currently being compiled.
* Turn this flag on if you want to find out which test among many takes more time
* to compile than the others or causes an infinite loop in the compiler.
*/
private inline val debugPrintProgress = false

/** Period between progress reports, in ms */
private inline val printProgressPeriod = 10000

/** Shows progress if debugPrintProgress is true */
private def showProgress(proc: => Unit)(using Context): Unit =
if !debugPrintProgress then proc
else
val watchdog = new TimerTask:
def run() = println(i"[compiling $units]")
try
new Timer().schedule(watchdog, printProgressPeriod, printProgressPeriod)
proc
finally watchdog.cancel()

private sealed trait PrintedTree
private /*final*/ case class SomePrintedTree(phase: String, tree: String) extends PrintedTree
private object NoPrintedTree extends PrintedTree
Expand Down