Bernd Schmidt - Java on uClinux (was: Null pointer check elimination) (original) (raw)

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• From: Bernd Schmidt <bernds_cb1 at t-online dot de>
• To: David Daney
• Cc: Gabriel Dos Reis , gcc at gcc dot gnu dot org, java at gcc dot gnu dot org
• Date: Tue, 15 Nov 2005 12🔞16 +0100
• Subject: Java on uClinux (was: Null pointer check elimination)
• References: <m3slu1vb2x.fsf@uniton.integrable-solutions.net> <200511122101.jACL17FV008454@earth.phy.uc.edu> <20051114173736.GB15434@synopsys.com> <4378DADA.1080508@mnmoran.org> <m3fypzhsi5.fsf@uniton.integrable-solutions.net> <4378FA7C.6000904@mnmoran.org> <m3wtjbgcgj.fsf@uniton.integrable-solutions.net> <43790043.1080204@mnmoran.org> <m3fypyhp3h.fsf@uniton.integrable-solutions.net> <43790EA1.3060004@mnmoran.org> <m3sltyg7ov.fsf@uniton.integrable-solutions.net> <437944B1.1010109@mnmoran.org> <m33blyfxlq.fsf@uniton.integrable-solutions.net> <43799001.5070103@avtrex.com>

David Daney wrote:

Perhaps not in general, but one unstated premise of this whole thread is that for some GCC targets (most Unix like operating systems) you *can* count on a SIGSEGV when you dereference a null pointer. The java front end takes advantage of this fact to eliminate explicit checks for dereferencing of null pointers.

Oh.Speaking of which, has anyone ported gcj to a MMU-less uClinux platform yet?
Bernd

• Follow-Ups:
  • Re: Java on uClinux (was: Null pointer check elimination)
    * From: Andrew Haley
• References:
  • Re: Null pointer check elimination
    * From: Gabriel Dos Reis
  • Re: Null pointer check elimination
    * From: Andrew Pinski
  • Re: Null pointer check elimination
    * From: Joe Buck
  • Re: Null pointer check elimination
    * From: Michael N. Moran
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    * From: Gabriel Dos Reis
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    * From: Michael N. Moran
  • Re: Null pointer check elimination
    * From: Gabriel Dos Reis
  • Re: Null pointer check elimination
    * From: Michael N. Moran
  • Re: Null pointer check elimination
    * From: Gabriel Dos Reis
  • Re: Null pointer check elimination
    * From: Michael N. Moran
  • Re: Null pointer check elimination
    * From: Gabriel Dos Reis
  • Re: Null pointer check elimination
    * From: Michael N. Moran
  • Re: Null pointer check elimination
    * From: Gabriel Dos Reis
  • Re: Null pointer check elimination
    * From: David Daney