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Recursive Java generics crash the compiler #942

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scabug opened this issue May 20, 2008 · 3 comments
Closed

Recursive Java generics crash the compiler #942

scabug opened this issue May 20, 2008 · 3 comments
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@odersky
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parser
Milestone
2.7.2

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@scabug
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scabug commented May 20, 2008

A Java generic class that refers to its own type crashes the classfile parser.

Java:

interface Field<A> {
}

public class Amount<Q> extends Object 
    implements Field<Amount<?>> {
}

Scala:

abstract class Foo {
  val x: Amount[Foo]
}

The classfile parser will try to resolve the Amount class type while parsing Amount, resulting in a busy assertion:

Exception in thread "main" java.lang.AssertionError: assertion failed: internal error: illegal class file dependency in classes/Amount.class
        at scala.Predef$$.assert(Predef.scala:92)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.parse(ClassfileParser.scala:60)
        at scala.tools.nsc.symtab.SymbolLoaders$$ClassfileLoader$$$$anonfun$$doComplete$$3.apply(SymbolLoaders.scala:287)
        at scala.tools.nsc.symtab.SymbolLoaders$$ClassfileLoader$$$$anonfun$$doComplete$$3.apply(SymbolLoaders.scala:287)
        at scala.tools.nsc.symtab.SymbolLoaders.completeClassfile(SymbolLoaders.scala:278)
        at scala.tools.nsc.symtab.SymbolLoaders$$ClassfileLoader.doComplete(SymbolLoaders.scala:286)
        at scala.tools.nsc.symtab.SymbolLoaders$$SymbolLoader.complete(SymbolLoaders.scala:80)
        at scala.tools.nsc.symtab.SymbolLoaders$$SymbolLoader.load(SymbolLoaders.scala:100)
        at scala.tools.nsc.symtab.Symbols$$Symbol.typeParams(Symbols.scala:655)
        at scala.tools.nsc.symtab.Types$$TypeMap.mapOver(Types.scala:2262)
        at scala.tools.nsc.symtab.Types$$ForEachTypeTraverser.traverse(Types.scala:2997)
        at scala.tools.nsc.symtab.Types$$Type.foreach(Types.scala:470)
        at scala.tools.nsc.symtab.Types$$class.existentialAbstraction(Types.scala:2083)
        at scala.tools.nsc.symtab.SymbolTable.existentialAbstraction(SymbolTable.scala:12)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.processClassType$$1(ClassfileParser.scala:509)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.sig2type$$1(ClassfileParser.scala:524)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.processClassType$$1(ClassfileParser.scala:503)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.sig2type$$1(ClassfileParser.scala:524)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.scala$$tools$$nsc$$symtab$$classfile$$ClassfileParser$$$$sigToType(ClassfileParser.scala:583)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.parseAttribute$$1(ClassfileParser.scala:606)
        at scala.tools.nsc.symtab.classfile.ClassfileParser$$$$anonfun$$parseAttributes$$1.apply(ClassfileParser.scala:770)
        at scala.tools.nsc.symtab.classfile.ClassfileParser$$$$anonfun$$parseAttributes$$1.apply(ClassfileParser.scala:770)
        at scala.Iterator$$class.foreach(Iterator.scala:395)
        at scala.RandomAccessSeq$$$$anon$$12.foreach(RandomAccessSeq.scala:138)
        at scala.Iterable$$class.foreach(Iterable.scala:256)
        at scala.Range.foreach(Range.scala:30)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.parseAttributes(ClassfileParser.scala:770)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.parseClass(ClassfileParser.scala:357)
        at scala.tools.nsc.symtab.classfile.ClassfileParser.parse(ClassfileParser.scala:84)
        at scala.tools.nsc.symtab.SymbolLoaders$$ClassfileLoader$$$$anonfun$$doComplete$$3.apply(SymbolLoaders.scala:287)
        at scala.tools.nsc.symtab.SymbolLoaders$$ClassfileLoader$$$$anonfun$$doComplete$$3.apply(SymbolLoaders.scala:287)
        at scala.tools.nsc.symtab.SymbolLoaders.completeClassfile(SymbolLoaders.scala:278)
        at scala.tools.nsc.symtab.SymbolLoaders$$ClassfileLoader.doComplete(SymbolLoaders.scala:286)
        at scala.tools.nsc.symtab.SymbolLoaders$$SymbolLoader.complete(SymbolLoaders.scala:80)
        at scala.tools.nsc.symtab.SymbolLoaders$$SymbolLoader.load(SymbolLoaders.scala:100)
        at scala.tools.nsc.symtab.Symbols$$Symbol.exists(Symbols.scala:386)
        at scala.tools.nsc.typechecker.Typers$$Typer.qualifies$$1(Typers.scala:2782)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedIdent$$1(Typers.scala:2797)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:3172)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedAppliedTypeTree$$1(Typers.scala:2915)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:3195)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3243)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedType(Typers.scala:3312)
        at scala.tools.nsc.typechecker.Namers$$Namer.typeSig(Namers.scala:851)
        at scala.tools.nsc.typechecker.Namers$$Namer$$$$anonfun$$getterTypeCompleter$$1.apply(Namers.scala:436)
        at scala.tools.nsc.typechecker.Namers$$Namer$$$$anonfun$$getterTypeCompleter$$1.apply(Namers.scala:434)
        at scala.tools.nsc.typechecker.Namers$$$$anon$$1.complete(Namers.scala:1009)
        at scala.tools.nsc.symtab.Symbols$$Symbol.info(Symbols.scala:508)
        at scala.tools.nsc.symtab.Symbols$$Symbol.initialize(Symbols.scala:622)
        at scala.tools.nsc.typechecker.Typers$$Typer.addGetterSetter(Typers.scala:1088)
        at scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$10.apply(Typers.scala:1163)
        at scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$10.apply(Typers.scala:1163)
        at scala.List.flatMap(List.scala:1120)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedTemplate(Typers.scala:1163)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedClassDef(Typers.scala:1039)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:2972)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3243)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3280)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedStat$$1(Typers.scala:1540)
        at scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$19.apply(Typers.scala:1585)
        at scala.tools.nsc.typechecker.Typers$$Typer$$$$anonfun$$19.apply(Typers.scala:1585)
        at scala.List$$.loop$$1(List.scala:293)
        at scala.List$$.mapConserve(List.scala:310)
        at scala.tools.nsc.typechecker.Typers$$Typer.typedStats(Typers.scala:1585)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed1(Typers.scala:2968)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3243)
        at scala.tools.nsc.typechecker.Typers$$Typer.typed(Typers.scala:3280)
        at scala.tools.nsc.typechecker.Analyzer$$typerFactory$$$$anon$$2.apply(Analyzer.scala:40)
        at scala.tools.nsc.Global$$GlobalPhase.applyPhase(Global.scala:257)
        at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:243)
        at scala.tools.nsc.Global$$GlobalPhase$$$$anonfun$$run$$1.apply(Global.scala:243)
        at scala.Iterator$$class.foreach(Iterator.scala:395)
        at scala.collection.mutable.ListBuffer$$$$anon$$1.foreach(ListBuffer.scala:266)
        at scala.tools.nsc.Global$$GlobalPhase.run(Global.scala:243)
        at scala.tools.nsc.Global$$Run.compileSources(Global.scala:556)
        at scala.tools.nsc.Global$$Run.compile(Global.scala:641)
        at scala.tools.nsc.Main$$.process(Main.scala:84)
        at scala.tools.nsc.Main$$.main(Main.scala:98)
        at scala.tools.nsc.Main.main(Main.scala)
@scabug
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scabug commented May 20, 2008

Imported From: https://issues.scala-lang.org/browse/SI-942?orig=1
Reporter: @dragos

@scabug
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scabug commented May 21, 2008

@odersky said:
fixed in r15139

@scabug
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scabug commented Jan 14, 2009

@odersky said:
Milestone next_bugfix deleted

@scabug scabug closed this as completed May 18, 2011
@scabug scabug added the parser label Apr 6, 2017
@scabug scabug added this to the 2.7.2 milestone Apr 6, 2017
@scabug scabug mentioned this issue Apr 7, 2017
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