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Add reflect ClassDef.apply and Symbol.newClass #14124

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merged 1 commit into from Mar 24, 2022
Merged

Add reflect ClassDef.apply and Symbol.newClass #14124

merged 1 commit into from Mar 24, 2022

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nicolasstucki
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@nicolasstucki nicolasstucki commented Dec 17, 2021 •
edited

We also add

  • SymbolMethods.typeRef
  • SymbolMethods.termRef
  • TypeTreeModule.ref

@nicolasstucki nicolasstucki self-assigned this Jan 13, 2022
@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 2 times, most recently from 8bc0c20 to 1fbda34 Compare February 18, 2022 09:08
@nicolasstucki nicolasstucki mentioned this pull request Feb 18, 2022
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@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 3 times, most recently from 647629e to 24586e1 Compare February 22, 2022 11:09
@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 2 times, most recently from 7def96e to d32d4af Compare February 28, 2022 08:23
@nicolasstucki nicolasstucki marked this pull request as ready for review February 28, 2022 12:07
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smarter requested changes Feb 28, 2022
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Otherwise LGTM.

compiler/src/scala/quoted/runtime/impl/QuotesImpl.scala Outdated Show resolved Hide resolved
library/src/scala/quoted/Quotes.scala Outdated Show resolved Hide resolved
library/src/scala/quoted/Quotes.scala Show resolved Hide resolved
@smarter smarter assigned nicolasstucki and unassigned smarter Feb 28, 2022
@nicolasstucki nicolasstucki changed the title Add reflect class def apply Add reflect ClassDef.apply and Symbol.newClass Mar 2, 2022
@nicolasstucki nicolasstucki added the release-notes Should be mentioned in the release notes label Mar 2, 2022
@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 2 times, most recently from 2254fa4 to 4845353 Compare March 2, 2022 08:13
@nicolasstucki nicolasstucki added release-notes Should be mentioned in the release notes and removed release-notes Should be mentioned in the release notes labels Mar 2, 2022
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library/src/scala/quoted/Quotes.scala Show resolved Hide resolved
tests/neg-macros/newClassExtendsNoParents/Macro_1.scala

val cls = Symbol.newClass(Symbol.spliceOwner, name, parents = Nil, decls, selfInfo = None)
val clsDef = ClassDef(cls, parents, body = List())
val newCls = Typed(Apply(Select(New(TypeIdent(cls)), cls.primaryConstructor), Nil), TypeTree.of[Object])
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I guess this is orthogonal but in tpd we have a New overload that takes constructor arguments this could be useful here too

@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 2 times, most recently from 072c154 to 4800912 Compare March 16, 2022 12:19
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library/src/scala/quoted/Quotes.scala Outdated Show resolved Hide resolved
tests/neg-macros/newClassExtendsNoParents.check Outdated Show resolved Hide resolved
library/src/scala/quoted/Quotes.scala
* @pre symbol.isType returns true
*/
@experimental
def typeRef: TypeRef
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It seems that we're missing an API to create a TypeRef/TermRef from a specific prefix: with foo.typeRef I can get a TypeRef this.foo and with pre.memberType(foo) I can get the info corresponding to pre.foo, but is there a way to generate the TypeRef pre.foo itself?

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Doesn't TypeRepr.select provide that?

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Oh indeed, I missed that one, maybe each of their documentation should @see the other one.

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Done

tests/run-macros/newClassSelf/Macro_1.scala Outdated
*/
def makeFooBar(using Quotes)(name: String, fooCls: quotes.reflect.Symbol): quotes.reflect.ClassDef = {
import quotes.reflect.*
val parents = List(Inferred(fooCls.typeRef), TypeTree.of[Bar])
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Perhaps instead of the Inferred(foo.typeRef) pattern we could have an overload of TypeTree.apply (or TypeTree.of? Not sure why we use of there) that takes a Symbol. This would be similar to the compiler-internal tpd.ref (in fact alternatively we could expose ref directly?)

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Added TypeTree.apply Added TypeTree.ref.

We should probably add TypeTree.apply as an alias of Inferred.apply. We cannot overload this method.

@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 5 times, most recently from d0bb8b6 to cf0b09e Compare March 22, 2022 14:53
@nicolasstucki nicolasstucki force-pushed the add-reflect-ClassDef-apply branch 3 times, most recently from a0d7004 to 26bb201 Compare March 23, 2022 15:48
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Otherwise LGTM!

library/src/scala/quoted/Quotes.scala Outdated Show resolved Hide resolved
@smarter smarter assigned nicolasstucki and unassigned smarter Mar 23, 2022
@nicolasstucki nicolasstucki merged commit a5d5fe5 into scala:main Mar 24, 2022
@nicolasstucki nicolasstucki deleted the add-reflect-ClassDef-apply branch March 24, 2022 08:39
@smarter smarter mentioned this pull request Apr 20, 2022
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This was referenced May 27, 2022
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@neko-kai neko-kai mentioned this pull request May 30, 2022
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@evbo evbo mentioned this pull request Jul 22, 2022
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evbo commented Jul 22, 2022 •
edited

@nicolasstucki thank you for this!!! I am noticing a class cast exception if I try pattern matching typeRef you added in this PR:

java.lang.ClassCastException: class dotty.tools.dotc.core.Names$SimpleName cannot be cast to class dotty.tools.dotc.core.Names$TypeName (dotty.tool
s.dotc.core.Names$SimpleName and dotty.tools.dotc.cor
e.Names$TypeName are in unnamed module of loader sbt.
internal.classpath.ClassLoaderCache$Key$CachedClassLo
ader @2c470fec)

e.g. if I try to check the type of a case class field like:

// scala 3.2.0-RC2
declaredField.companionClass.caseFields.map { ccField =>
  val tt = ccField.typeRef match {
    case TypeRef(typeRepr, args) => s"args are: ${args}"
  }
}

I wasn't sure if this was a separate bug or not, happy to open a new one. It does seem odd seeing that exception; feels like a class cast exception happening internally so thought it might be important.

Update: I've found this and while I'm still not sure about that class cast exception above, it does seem to be the case that matching on AppliedType will yield the type args

@Kordyjan Kordyjan added this to the 3.1.3 milestone Aug 1, 2023
This was referenced Sep 5, 2023
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No way to get a TypeRepr directly from a Symbol Quotes: generate arbitrary trait or class implementations
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@nicolasstucki @evbo @smarter @Kordyjan