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Crash in JVM backend for optimised tuple extraction #23596

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Crash in JVM backend for optimised tuple extraction#23596
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area:tuplesitype:bugitype:crashregressionThis worked in a previous version but doesn't anymore
@WojciechMazur

Description

@WojciechMazur
WojciechMazur
opened on Jul 24, 2025

Based on OpenCB failure in dfianthdl/dfhdl - build logs

Compiler version

Bisect points to 6e466de / #23373
Last good release: 3.7.3-RC1-bin-20250710-01447df-NIGHTLY
First bad release: 3.7.3-RC1-bin-20250711-5429b1f-NIGHTLY

Minimized code

Reproduction steps:

git clone https://github.com/DFiantHDL/DFHDL -b v0.12.0 repo
cd repo
sbt ++3.7.3-RC1-bin-20250711-5429b1f-NIGHTLY!;core/Test/compile

No minimization yet due to complicated codebase and usage of dedicated compiler plugin

Crash can be triggered by this snippet:

import dfhdl.*

class DFTupleSpec extends core.HasDFC:
  final lazy val dfc: DFC = ???
  inline def test(body: => Unit): Unit = ???
  
  test {
    val t13: (UInt[8], Bit) <> VAL = ???
    val (t16, t17) = t13.asScalaTuple
  }

Output (click arrow to expand)

[info] compiling 2 Scala sources to /Users/wmazur/projects/scala/community-build3/repo/core/target/scala-3.7.3-RC1-bin-20250723-14b7f03-NIGHTLY/test-classes ...
java.util.NoSuchElementException: key not found: val $2$
  | => cat scala.collection.MapOps.default(Map.scala:289)
        at scala.collection.MapOps.default$(Map.scala:288)
        at scala.collection.AbstractMap.default(Map.scala:420)
        at scala.collection.mutable.HashMap.apply(HashMap.scala:440)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder$locals$.load(BCodeSkelBuilder.scala:583)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadTo(BCodeBodyBuilder.scala:439)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:303)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:297)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadQualifier(BCodeBodyBuilder.scala:1191)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genApply(BCodeBodyBuilder.scala:834)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadTo(BCodeBodyBuilder.scala:385)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:303)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genComparisonOp$1(BCodeBodyBuilder.scala:1569)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genCond(BCodeBodyBuilder.scala:1617)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadIfTo(BCodeBodyBuilder.scala:224)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadTo(BCodeBodyBuilder.scala:329)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:303)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadTo(BCodeBodyBuilder.scala:320)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoad(BCodeBodyBuilder.scala:303)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genStat(BCodeBodyBuilder.scala:117)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genBlockTo$$anonfun$1(BCodeBodyBuilder.scala:1093)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.immutable.List.foreach(List.scala:334)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genBlockTo(BCodeBodyBuilder.scala:1093)
        at dotty.tools.backend.jvm.BCodeBodyBuilder$PlainBodyBuilder.genLoadTo(BCodeBodyBuilder.scala:457)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.emitNormalMethodBody$1(BCodeSkelBuilder.scala:899)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genDefDef(BCodeSkelBuilder.scala:922)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:699)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen$$anonfun$1(BCodeSkelBuilder.scala:705)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.immutable.List.foreach(List.scala:334)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.gen(BCodeSkelBuilder.scala:705)
        at dotty.tools.backend.jvm.BCodeSkelBuilder$PlainSkelBuilder.genPlainClass(BCodeSkelBuilder.scala:293)
        at dotty.tools.backend.jvm.CodeGen.genClass(CodeGen.scala:160)
        at dotty.tools.backend.jvm.CodeGen.genClassDef$1(CodeGen.scala:61)
        at dotty.tools.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:117)
        at dotty.tools.backend.jvm.CodeGen.genClassDefs$1$$anonfun$1(CodeGen.scala:115)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.immutable.List.foreach(List.scala:334)
        at dotty.tools.backend.jvm.CodeGen.genClassDefs$1(CodeGen.scala:115)
        at dotty.tools.backend.jvm.CodeGen.genUnit(CodeGen.scala:120)
        at dotty.tools.backend.jvm.GenBCode.run(GenBCode.scala:90)
        at dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:383)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.immutable.List.foreach(List.scala:334)
        at dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:376)
        at dotty.tools.backend.jvm.GenBCode.runOn(GenBCode.scala:98)
        at dotty.tools.dotc.Run.runPhases$1$$anonfun$1(Run.scala:368)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1324)
        at dotty.tools.dotc.Run.runPhases$1(Run.scala:361)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1$$anonfun$2(Run.scala:408)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1$$anonfun$adapted$1(Run.scala:408)
        at scala.Function0.apply$mcV$sp(Function0.scala:42)
        at dotty.tools.dotc.Run.showProgress(Run.scala:470)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:408)
        at dotty.tools.dotc.Run.compileUnits$$anonfun$adapted$1(Run.scala:420)
        at dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:69)
        at dotty.tools.dotc.Run.compileUnits(Run.scala:420)
        at dotty.tools.dotc.Run.compileSources(Run.scala:307)
        at dotty.tools.dotc.Run.compile(Run.scala:292)
        at dotty.tools.dotc.Driver.doCompile(Driver.scala:37)
        at dotty.tools.xsbt.CompilerBridgeDriver.run(CompilerBridgeDriver.java:141)
        at dotty.tools.xsbt.CompilerBridge.run(CompilerBridge.java:22)
        at sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
        at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:196)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:252)
        at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:186)
        at sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:166)
        at sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:241)
        at sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:166)
        at sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:214)
        at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:542)
        at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:542)
        at sbt.internal.inc.Incremental$.$anonfun$apply$3(Incremental.scala:182)
        at sbt.internal.inc.Incremental$.$anonfun$apply$3$adapted(Incremental.scala:180)
        at sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:458)
        at sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
        at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
        at sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
        at sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:264)
        at sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:413)
        at sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:500)
        at sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:400)
        at sbt.internal.inc.Incremental$.apply(Incremental.scala:208)
        at sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:542)
        at sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:496)
        at sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
        at sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:433)
        at sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
        at sbt.Defaults$.compileIncrementalTaskImpl(Defaults.scala:2490)
        at sbt.Defaults$.$anonfun$compileIncrementalTask$2(Defaults.scala:2440)
        at sbt.internal.server.BspCompileTask$.$anonfun$compute$1(BspCompileTask.scala:41)
        at sbt.internal.io.Retry$.sbt$internal$io$Retry$$impl(Retry.scala:114)
        at sbt.internal.io.Retry$.io(Retry.scala:102)
        at sbt.internal.io.Retry$.io(Retry.scala:78)
        at sbt.internal.io.Retry$.io(Retry.scala:67)
        at sbt.internal.server.BspCompileTask$.compute(BspCompileTask.scala:41)
        at sbt.Defaults$.$anonfun$compileIncrementalTask$1(Defaults.scala:2438)
        at scala.Function1.$anonfun$compose$1(Function1.scala:49)
        at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:63)
        at sbt.std.Transform$$anon$4.work(Transform.scala:69)
        at sbt.Execute.$anonfun$submit$2(Execute.scala:283)
        at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
        at sbt.Execute.work(Execute.scala:292)
        at sbt.Execute.$anonfun$submit$1(Execute.scala:283)
        at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
        at sbt.CompletionService$$anon$2.call(CompletionService.scala:65)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
        at java.base/java.lang.Thread.run(Thread.java:1583)
[error] Error while emitting /Users/wmazur/projects/scala/community-build3/repo/core/src/test/scala/CoreSpec/DFTupleSpec.scala
[error] key not found: val $2$
[error] one error found
[error] (core / Test / compileIncremental) Compilation failed

FYI @soronpo
PS. Also compiler plugin can crash on it's own if class DFTupleSpec does not extends core.HasDFC

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