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Forward-port changes from Linker rewrite rules.
Add support for conditional rewrites, simple purity checking as well as constant-checking.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,25 +1,44 @@ | ||
| import dotty.linker.rewrites | ||
| import dotty.linker._ | ||
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||
| @rewrites | ||
| object rules{ | ||
| def twoDropsOnes(x: List[Int]) = | ||
| x.drop(1).drop(1) | ||
| def twoDropsOnes$opt(x: List[Int]) = | ||
| x.drop(2) | ||
| object rules/* extends NeedsMeta */ { | ||
| def twoDropsOnes(x: List[Int]) = | ||
| Rewrite(x.drop(1).drop(1), x.drop(2)) | ||
| def twoDropRights(x: List[Int], a: Int, b: Int) = | ||
| x.dropRight(a).dropRight(b) | ||
| def twoDropRights$opt(x: List[Int], a: Int, b: Int) = | ||
| x.dropRight(a + b) | ||
| def twoFilters(x: List[Int], a: Int => Boolean, b: Int => Boolean) = | ||
| x.filter(a).filter(b) | ||
| def twoFilters$opt(x: List[Int], a: Int => Boolean, b: Int => Boolean) = | ||
| x.filter(x => a(x) && b(x)) | ||
| Rewrite(x.dropRight(a).dropRight(b), x.dropRight(a + b)) | ||
|
|
||
| /************************************/ | ||
| def twoFilters(x: List[Int], a: Int => Boolean, b: Int => Boolean)(implicit apure: IsPure[a.type]) = | ||
| Rewrite(from = x.filter(a).filter(b), | ||
| to = x.filter(x => a(x) && b(x))) | ||
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| def prettyPrint(x: Any)(implicit source: Source[x.type]) = | ||
| Rewrite(Test.myPrettyPrint(x), println(source + " = " + x)) | ||
|
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| /* | ||
| def twoFilters(x: List[Int], a: Int => Boolean, b: Int => Boolean) = | ||
| Rewrite(filter = meta.isPure(a), // restriction: the expressions that are used here are very limited | ||
| from = x.filter(a).filter(b), | ||
| to = x.filter(x => a(x) && b(x))) | ||
| def twoFilters(x: List[Int], a: Int => Boolean, b: Int => Boolean)(implicit meta: Semantics) = | ||
| if (meta.isPure(a)) | ||
| Rewrite(x.filter(a).filter(b), x.filter(x => a(x) && b(x))) | ||
| def twoFilters(x: List[Int], a: Int => Boolean, b: Int => Boolean) = | ||
| RewriteMeta(meta{ /* full blown meta */ }) | ||
| */ | ||
| } | ||
|
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||
| object Test{ | ||
| def myPrettyPrint(a: Any) = ??? | ||
| def main(args: Array[String]): Unit = { | ||
| List(1,2,3).drop(1).drop(1) | ||
| List(1,2,3).dropRight(1).dropRight(1) | ||
| List(1,2,3).filter(_ > 2).filter(_ > 1) | ||
| myPrettyPrint(args.length) | ||
| } | ||
| } |