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Use inline and inline-if to ensure constant folding happened #7202

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Merged
merged 1 commit into from
Sep 12, 2019
Merged

Use inline and inline-if to ensure constant folding happened #7202

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27 changes: 10 additions & 17 deletions compiler/src/dotty/tools/dotc/reporting/trace.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -25,47 +25,40 @@ object trace extends TraceSyntax {
abstract class TraceSyntax {
val isForced: Boolean

@forceInline
def onDebug[TD](question: => String)(op: => TD)(implicit ctx: Context): TD =
inline def onDebug[TD](question: => String)(op: => TD)(implicit ctx: Context): TD =
conditionally(ctx.settings.YdebugTrace.value, question, false)(op)

@forceInline
def conditionally[TC](cond: Boolean, question: => String, show: Boolean)(op: => TC)(implicit ctx: Context): TC =
if (isForced || Config.tracingEnabled) {
inline def conditionally[TC](cond: Boolean, question: => String, show: Boolean)(op: => TC)(implicit ctx: Context): TC =
inline if (isForced || Config.tracingEnabled) {
def op1 = op
if (cond) apply[TC](question, Printers.default, show)(op1)
else op1
}
else op

@forceInline
def apply[T](question: => String, printer: Printers.Printer, showOp: Any => String)(op: => T)(implicit ctx: Context): T =
if (isForced || Config.tracingEnabled) {
inline def apply[T](question: => String, printer: Printers.Printer, showOp: Any => String)(op: => T)(implicit ctx: Context): T =
inline if (isForced || Config.tracingEnabled) {
def op1 = op
if (!isForced && printer.eq(config.Printers.noPrinter)) op1
else doTrace[T](question, printer, showOp)(op1)
}
else op

@forceInline
def apply[T](question: => String, printer: Printers.Printer, show: Boolean)(op: => T)(implicit ctx: Context): T =
if (isForced || Config.tracingEnabled) {
inline def apply[T](question: => String, printer: Printers.Printer, show: Boolean)(op: => T)(implicit ctx: Context): T =
inline if (isForced || Config.tracingEnabled) {
def op1 = op
if (!isForced && printer.eq(config.Printers.noPrinter)) op1
else doTrace[T](question, printer, if (show) showShowable(_) else alwaysToString)(op1)
}
else op

@forceInline
def apply[T](question: => String, printer: Printers.Printer)(op: => T)(implicit ctx: Context): T =
inline def apply[T](question: => String, printer: Printers.Printer)(op: => T)(implicit ctx: Context): T =
apply[T](question, printer, false)(op)

@forceInline
def apply[T](question: => String, show: Boolean)(op: => T)(implicit ctx: Context): T =
inline def apply[T](question: => String, show: Boolean)(op: => T)(implicit ctx: Context): T =
apply[T](question, Printers.default, show)(op)

@forceInline
def apply[T](question: => String)(op: => T)(implicit ctx: Context): T =
inline def apply[T](question: => String)(op: => T)(implicit ctx: Context): T =
apply[T](question, Printers.default, false)(op)

private def showShowable(x: Any)(implicit ctx: Context) = x match {
Expand Down