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Re: GC Merge?

To: jason at cygnus dot com
Subject: Re: GC Merge?
From: Mark Mitchell <mark at codesourcery dot com>
Date: Fri, 03 Sep 1999 10:11:29 -0700
Cc: gcc at gcc dot gnu dot org
Organization: CodeSourcery, LLC
References: <19990902113937C.mitchell@codesourcery.com><u9671svtw8.fsf@yorick.cygnus.com>

>>>>> "Jason" == Jason Merrill <jason@cygnus.com> writes:

    >> Most of these problems stem from the fact that obstacks are a
    >> nuisance.  In particular, we were copying things to the
    >> permanent obstack, and some expressions canot be copied.

    Jason> And we can't just allocated them on the permanent obstack
    Jason> to begin with?

Right.  One good example is SAVE_EXPRs: they can't be copied because
if there are two copies they must be the same.  Trying to get GCC to
put SAVE_EXPRs on the permanent obstack, without putting all temporary
junk there, seems really hard.

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Follow-Ups:
- Re: GC Merge?
  - From: Jason Merrill

References:
- GC Merge?
  - From: Mark Mitchell
- Re: GC Merge?
  - From: Jason Merrill

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