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scalac 2.11.1 crash in GenASM, nested Boolean/Nothing expressions #8625

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scabug opened this issue May 26, 2014 · 4 comments
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scalac 2.11.1 crash in GenASM, nested Boolean/Nothing expressions #8625

scabug opened this issue May 26, 2014 · 4 comments
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@lrytz
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backend compiler crash minimized
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2.11.2

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@scabug
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scabug commented May 26, 2014

The scala compiler crashes with expressions of the form

 ((a || ???) && (b || ???))

where ??? is of type Nothing (i.e., throws an exception).
The Bug is not triggered by (a || ???).

A quick look at scala.tools.nsc.backend.jvm.GenASM indicates an undefined failure label:

2442: jcode.emitIF(cond.negate(), labels(failure))

This is a regression from Scala 2.10.

(see: scala/scala#2185, https://github.com/scala/scala/issues/3793)

Workaround: -YdisableUnreachablePrevention
(Alternatively: -Ylinearizer:normal)

java version "1.7.0_55"
OpenJDK Runtime Environment (IcedTea 2.4.7) (ArchLinux build 7.u55_2.4.7-1-x86_64)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)

Scala code runner version 2.11.1 -- Copyright 2002-2013, LAMP/EPFL
@scabug
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scabug commented May 26, 2014

Imported From: https://issues.scala-lang.org/browse/SI-8625?orig=1
Reporter: Gidon Ernst (gernst)
Affected Versions: 2.11.1
Attachments:

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scabug commented May 26, 2014

@retronym said:
Here's a diff of -Ylog:icode -Ydebug without/with unreachable block prevention:

https://gist.github.com/retronym/ccdca4c9085b36964ebb

@scabug
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scabug commented May 27, 2014

@retronym said:
WIP: https://github.com/retronym/scala/tree/ticket/8625

@scabug scabug closed this as completed May 27, 2014
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scabug commented Jul 21, 2014

@lrytz said:
fixed in scala/scala#3794

@scabug scabug added this to the 2.11.2 milestone Apr 7, 2017
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