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ClassfileParser: allow missing param names (for JDK 21) #17536

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merged 1 commit into from May 22, 2023

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@SethTisue SethTisue commented May 19, 2023

this is a forward port of scala/scala#10397 (fixing scala/bug#12783, from which Scala 3 also suffers) — the same fix we'll be shipping in 2.12.18 and 2.13.11

I haven't included a unit test, because

  • a similar change has already been well validated in a Scala 2 context
  • without this change, the compiler can't compile anything at all on JDK 21
  • we need the reference compiler to include this change before we can bootstrap on JDK 21 anyway

but I did manually test it locally, by bootstrapping on JDK 11, publishing the resulting compiler locally, and then launching the REPL on JDK 21 and evaluating 2 + 2

on 3.3.0-RC6, that fails with:

error while loading AccessFlag,
class file /modules/java.base/java/lang/reflect/AccessFlag.class is broken, reading aborted with class java.lang.RuntimeException
bad constant pool index: 0 at pos: 5189
error while loading ElementType,
class file /modules/java.base/java/lang/annotation/ElementType.class is broken, reading aborted with class java.lang.RuntimeException
bad constant pool index: 0 at pos: 1220
2 errors found

whereas with this change, it succeeds.

this is a forward port of scala/scala#10397 (fixing scala/bug#12783,
from which Scala 3 also suffers)
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He-Pin commented May 22, 2023

This will be included in the Scala 3.3.0-RC7?

@SethTisue
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This will be included in the Scala 3.3.0-RC7?

Nah, it can wait for 3.3.1.

@SethTisue SethTisue requested a review from smarter May 22, 2023 06:58
@smarter smarter merged commit c205a89 into scala:main May 22, 2023
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@SethTisue SethTisue deleted the fix-classfile-parsing-on-jdk-21 branch May 22, 2023 17:55
SethTisue added a commit to SethTisue/scala that referenced this pull request May 25, 2023
this should work on JDK 21 now that scala/scala3#17536
has been merged
@SethTisue
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This will be included in the Scala 3.3.0-RC7?

(It's in 3.3.1-RC1, which is now on Maven Central.)

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3 participants