diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/transform/UnCurry.scala')
-rw-r--r-- | src/compiler/scala/tools/nsc/transform/UnCurry.scala | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/UnCurry.scala b/src/compiler/scala/tools/nsc/transform/UnCurry.scala index 163c44822e..57639a94c7 100644 --- a/src/compiler/scala/tools/nsc/transform/UnCurry.scala +++ b/src/compiler/scala/tools/nsc/transform/UnCurry.scala @@ -237,7 +237,7 @@ abstract class UnCurry extends InfoTransform def canUseDelamdafyMethod = ( (inConstructorFlag == 0) // Avoiding synthesizing code prone to SI-6666, SI-8363 by using old-style lambda translation - && (!isSpecialized || (settings.isBCodeActive && settings.target.value == "jvm-1.8")) // DelambdafyTransformer currently only emits generic FunctionN-s, use the old style in the meantime + && (!isSpecialized || settings.isBCodeActive) // DelambdafyTransformer currently only emits generic FunctionN-s, use the old style in the meantime ) if (inlineFunctionExpansion || !canUseDelamdafyMethod) { val parents = addSerializable(abstractFunctionForFunctionType(fun.tpe)) @@ -582,6 +582,7 @@ abstract class UnCurry extends InfoTransform } case dd @ DefDef(_, _, _, vparamss0, _, rhs0) => + val ddSym = dd.symbol val (newParamss, newRhs): (List[List[ValDef]], Tree) = if (dependentParamTypeErasure isDependent dd) dependentParamTypeErasure erase dd @@ -593,11 +594,22 @@ abstract class UnCurry extends InfoTransform (vparamss1, rhs0) } + // A no-arg method with ConstantType result type can safely be reduced to the corresponding Literal + // (only pure methods are typed as ConstantType). We could also do this for methods with arguments, + // after ensuring the arguments are not referenced. + val literalRhsIfConst = + if (newParamss.head.isEmpty) { // We know newParamss.length == 1 from above + ddSym.info.resultType match { + case tp@ConstantType(value) => Literal(value) setType tp setPos newRhs.pos // inlining of gen.mkAttributedQualifier(tp) + case _ => newRhs + } + } else newRhs + val flatdd = copyDefDef(dd)( vparamss = newParamss, - rhs = nonLocalReturnKeys get dd.symbol match { - case Some(k) => atPos(newRhs.pos)(nonLocalReturnTry(newRhs, k, dd.symbol)) - case None => newRhs + rhs = nonLocalReturnKeys get ddSym match { + case Some(k) => atPos(newRhs.pos)(nonLocalReturnTry(literalRhsIfConst, k, ddSym)) + case None => literalRhsIfConst } ) addJavaVarargsForwarders(dd, flatdd) |