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author | Jan Niehusmann <jan@gondor.com> | 2012-11-09 15:05:58 +0100 |
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committer | Jan Niehusmann <jan@gondor.com> | 2012-11-09 19:01:12 +0100 |
commit | b540aaee4ba30e2dd980456a44e8c6d732222df1 (patch) | |
tree | 8bd5886a516375d8fb81acf1bc188535b9275938 /src | |
parent | 4f98d50bc23acab19e99d35c3e6a046a147984ba (diff) | |
download | scala-b540aaee4ba30e2dd980456a44e8c6d732222df1.tar.gz scala-b540aaee4ba30e2dd980456a44e8c6d732222df1.tar.bz2 scala-b540aaee4ba30e2dd980456a44e8c6d732222df1.zip |
Fix SI-6637 (misoptimization in erasure)
Move the optimization one level deeper so the expression
being tested with isInstanceOf is always evaluated.
Diffstat (limited to 'src')
-rw-r--r-- | src/compiler/scala/tools/nsc/transform/Erasure.scala | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/Erasure.scala b/src/compiler/scala/tools/nsc/transform/Erasure.scala index 5c18d1dc6d..cfc3d0a377 100644 --- a/src/compiler/scala/tools/nsc/transform/Erasure.scala +++ b/src/compiler/scala/tools/nsc/transform/Erasure.scala @@ -1033,17 +1033,17 @@ abstract class Erasure extends AddInterfaces Apply(Select(qual, cmpOp), List(gen.mkAttributedQualifier(targ.tpe))) } case RefinedType(parents, decls) if (parents.length >= 2) => - // Optimization: don't generate isInstanceOf tests if the static type - // conforms, because it always succeeds. (Or at least it had better.) - // At this writing the pattern matcher generates some instance tests - // involving intersections where at least one parent is statically known true. - // That needs fixing, but filtering the parents here adds an additional - // level of robustness (in addition to the short term fix.) - val parentTests = parents filterNot (qual.tpe <:< _) - - if (parentTests.isEmpty) Literal(Constant(true)) - else gen.evalOnce(qual, currentOwner, unit) { q => - atPos(tree.pos) { + gen.evalOnce(qual, currentOwner, unit) { q => + // Optimization: don't generate isInstanceOf tests if the static type + // conforms, because it always succeeds. (Or at least it had better.) + // At this writing the pattern matcher generates some instance tests + // involving intersections where at least one parent is statically known true. + // That needs fixing, but filtering the parents here adds an additional + // level of robustness (in addition to the short term fix.) + val parentTests = parents filterNot (qual.tpe <:< _) + + if (parentTests.isEmpty) Literal(Constant(true)) + else atPos(tree.pos) { parentTests map mkIsInstanceOf(q) reduceRight gen.mkAnd } } |