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author | Felix Mulder <felix.mulder@gmail.com> | 2016-11-02 11:08:28 +0100 |
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committer | Guillaume Martres <smarter@ubuntu.com> | 2016-11-22 01:35:07 +0100 |
commit | 8a61ff432543a29234193cd1f7c14abd3f3d31a0 (patch) | |
tree | a8147561d307af862c295cfc8100d271063bb0dd /compiler/src/dotty/tools/dotc/transform/SeqLiterals.scala | |
parent | 6a455fe6da5ff9c741d91279a2dc6fe2fb1b472f (diff) | |
download | dotty-8a61ff432543a29234193cd1f7c14abd3f3d31a0.tar.gz dotty-8a61ff432543a29234193cd1f7c14abd3f3d31a0.tar.bz2 dotty-8a61ff432543a29234193cd1f7c14abd3f3d31a0.zip |
Move compiler and compiler tests to compiler dir
Diffstat (limited to 'compiler/src/dotty/tools/dotc/transform/SeqLiterals.scala')
-rw-r--r-- | compiler/src/dotty/tools/dotc/transform/SeqLiterals.scala | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/transform/SeqLiterals.scala b/compiler/src/dotty/tools/dotc/transform/SeqLiterals.scala new file mode 100644 index 000000000..49ea69530 --- /dev/null +++ b/compiler/src/dotty/tools/dotc/transform/SeqLiterals.scala @@ -0,0 +1,48 @@ +package dotty.tools.dotc +package transform + +import core._ +import Types._ +import dotty.tools.dotc.transform.TreeTransforms._ +import Contexts.Context +import Symbols._ +import Phases._ +import Decorators._ + +/** A transformer that eliminates SeqLiteral's, transforming `SeqLiteral(elems)` to an operation + * equivalent to + * + * JavaSeqLiteral(elems).toSeq + * + * Instead of `toSeq`, which takes an implicit, the appropriate "wrapArray" method + * is called directly. The reason for this step is that JavaSeqLiterals, being arrays + * keep a precise type after erasure, whereas SeqLiterals only get the erased type `Seq`, + */ +class SeqLiterals extends MiniPhaseTransform { + import ast.tpd._ + + override def phaseName = "seqLiterals" + override def runsAfter: Set[Class[_ <: Phase]] = Set(classOf[PatternMatcher]) + + override def checkPostCondition(tree: Tree)(implicit ctx: Context): Unit = tree match { + case tpd: SeqLiteral => assert(tpd.isInstanceOf[JavaSeqLiteral]) + case _ => + } + + override def transformSeqLiteral(tree: SeqLiteral)(implicit ctx: Context, info: TransformerInfo): Tree = tree match { + case tree: JavaSeqLiteral => tree + case _ => + val arr = JavaSeqLiteral(tree.elems, tree.elemtpt) + //println(i"trans seq $tree, arr = $arr: ${arr.tpe} ${arr.tpe.elemType}") + val elemtp = tree.elemtpt.tpe + val elemCls = elemtp.classSymbol + val (wrapMethStr, targs) = + if (elemCls.isPrimitiveValueClass) (s"wrap${elemCls.name}Array", Nil) + else if (elemtp derivesFrom defn.ObjectClass) ("wrapRefArray", elemtp :: Nil) + else ("genericWrapArray", elemtp :: Nil) + ref(defn.ScalaPredefModule) + .select(wrapMethStr.toTermName) + .appliedToTypes(targs) + .appliedTo(arr) + } +} |