Re: Strange C developments

From	Jens Gustedt <jens.gustedt@loria.fr>
Newsgroups	comp.lang.c
Subject	Re: Strange C developments
Date	2012-08-02 21:23 +0200
Organization	A noiseless patient Spider
Message-ID	<501AD3CC.7030006@loria.fr> (permalink)
References	<juchoa$974$1@speranza.aioe.org> <a89497c5-d2a0-47d7-82e5-fdb9be6a0d3e@m10g2000vbn.googlegroups.com> <796fadf8-6402-4a73-b110-f4e750ca1d79@8g2000vbx.googlegroups.com>

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Am 02.08.2012 15:08, schrieb tom st denis:
> Syntactically it'd be pretty easy to have something like
> 
> heap int *p;
> 
> where "heap" defaults to init it to NULL and then at the end a call to
> free() is made automatically.
> 
> That sort of syntax would make certain functions a bit easier to work
> with, infinitely more useful would be something like
> 
> heap int foo[34]; // or whatever array size
> 
> Where it allocates "foo" off the heap (via calloc) automagically,
> raising a signal if it fails, and then when the function returns it
> calls free() on it.
> 
> That would be very useful for small stackframe applications.

Why would you need such a "heap" marker syntactically?

For your first example for the pointer (syntactically) I would just do

int foo[1];

An implementation could just decide to allocate "auto" arrays on the
heap, and free everything at the end of the liftime of the variable. You
don't have to add a jota to the syntax of C for that.

The downside of such a "heap" approach for array allocation is that the
implementation of setjmp/longjmp would be come a bit more complicated.
You can't just re-adjust the stack pointer but you'd have to re-invent a
mechanism that "free"s all the allocated arrays on the way down, once
you jump to a different function stack. Isn't completely trivial.

Jens


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Thread

Strange C developments Jase Schick <nospam@nospam.com> - 2012-07-20 21:14 +0000
  Re: Strange C developments Les Cargill <lcargill99@comcast.com> - 2012-07-20 18:03 -0500
  Re: Strange C developments "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2012-07-20 16:03 -0700
    Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-07-21 15:11 -0700
    Re: Strange C developments tom st denis <tom@iahu.ca> - 2012-08-02 06:08 -0700
      Re: Strange C developments Jens Gustedt <jens.gustedt@loria.fr> - 2012-08-02 21:23 +0200
        Re: Strange C developments tom st denis <tom@iahu.ca> - 2012-08-03 04:13 -0700
          Re: Strange C developments Noob <root@127.0.0.1> - 2012-08-03 13:19 +0200
          Re: Strange C developments Anders Wegge Keller <wegge@wegge.dk> - 2012-08-03 13:31 +0200
          Re: Strange C developments Jens Gustedt <jens.gustedt@loria.fr> - 2012-08-03 23:47 +0200
      Re: Strange C developments gwowen <gwowen@gmail.com> - 2012-08-03 02:20 -0700
  Re: Strange C developments Rui Maciel <rui.maciel@gmail.com> - 2012-07-21 01:25 +0100
  Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-20 19:38 -0500
  Re: Strange C developments Nobody <nobody@nowhere.com> - 2012-07-21 10:32 +0100
    Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-21 09:31 -0500
      Re: Strange C developments Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-21 17:38 +0100
        Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-21 12:58 -0500
        Re: Strange C developments Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-21 11:42 -0700
          Re: Strange C developments Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-21 20:13 +0100
            Re: Strange C developments Nobody <nobody@nowhere.com> - 2012-07-21 20:48 +0100
              Re: Strange C developments Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-21 23:32 +0100
  Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-21 11:43 +0200
    Re: Strange C developments Quentin Pope <qp19433@hotmail.NOSPAM.com> - 2012-07-21 10:23 +0000
      Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-21 13:01 +0200
        Re: Strange C developments gordonb.y4pdz@burditt.org (Gordon Burditt) - 2012-07-21 08:57 -0500
          Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-21 10:40 -0500
          Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-21 19:03 +0200
            Re: Strange C developments gordonb.5rhpu@burditt.org (Gordon Burditt) - 2012-07-22 02:08 -0500
              Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-22 12:32 +0200
                Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-22 08:26 -0500
            Re: Strange C developments Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-07-24 01:23 -0700
              Re: Strange C developments Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-24 05:36 -0700
                Re: Strange C developments Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-07-30 02:04 -0700
              Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-24 09:55 -0500
                Re: Strange C developments 88888 Dihedral <dihedral88888@googlemail.com> - 2012-08-02 06:44 -0700
                Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-08-03 08:48 -0500
          Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-21 19:06 +0200
            Re: Strange C developments gordonb.ibds9@burditt.org (Gordon Burditt) - 2012-07-22 02:28 -0500
              Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-22 12:30 +0200
              Re: Strange C developments Philip Lantz <prl@canterey.us> - 2012-07-24 00:58 -0700
        Re: Strange C developments Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-07-24 01:13 -0700
      Re: Strange C developments Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-21 05:44 -0700
        Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-07-21 15:31 -0700
          Re: Strange C developments Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-21 16:59 -0700
            Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-07-21 23:46 -0700
              Re: Strange C developments "io_x" <a@b.c.invalid> - 2012-07-22 10:37 +0200
                Re: Strange C developments Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-22 03:28 -0700
                Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-22 09:05 -0500
                Re: Strange C developments Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-07-24 02:10 -0700
                Re: Strange C developments "io_x" <a@b.c.invalid> - 2012-07-27 20:47 +0200
                Re: Strange C developments Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-07-30 02:09 -0700
                Re: Strange C developments "BartC" <bc@freeuk.com> - 2012-07-30 13:05 +0100
                Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-08-03 10:45 -0500
                Re: Strange C developments "io_x" <a@b.c.invalid> - 2012-07-30 16:52 +0200
                Re: Strange C developments "io_x" <a@b.c.invalid> - 2012-07-30 18:26 +0200
                Re: Strange C developments Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-08-03 12:12 -0700
                Re: Strange C developments "BartC" <bc@freeuk.com> - 2012-08-04 12:18 +0100
                Re: Strange C developments Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-08-10 09:50 +0300
                Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-09-07 11:19 -0700
                Re: Strange C developments "io_x" <a@b.c.invalid> - 2012-09-09 12:06 +0200
                Re: Strange C developments Kaz Kylheku <kaz@kylheku.com> - 2012-09-09 05:25 +0000
          Re: Strange C developments Melzzzzz <mel@zzzzz.com> - 2012-07-22 02:48 +0200
          Re: Strange C developments William Ahern <william@wilbur.25thandClement.com> - 2012-07-21 21:45 -0700
            Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-07-22 02:40 -0700
              Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-22 10:38 -0500
          Re: Strange C developments William Ahern <william@wilbur.25thandClement.com> - 2012-07-21 22:38 -0700
            Re: Strange C developments jacob navia <jacob@spamsink.net> - 2012-07-22 08:43 +0200
            Re: Strange C developments "BartC" <bc@freeuk.com> - 2012-07-22 11:24 +0100
              Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-08-03 09:09 -0500
                Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-08-03 16:54 -0500
          Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-07-21 23:16 -0700
            Re: Strange C developments Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-07-22 17:50 +0300
              Re: Strange C developments BGB <cr88192@hotmail.com> - 2012-07-22 11:27 -0500
                Re: Strange C developments Ike Naar <ike@iceland.freeshell.org> - 2012-07-22 20:55 +0000
                Re: Strange C developments Philip Lantz <prl@canterey.us> - 2012-07-24 00:56 -0700
                Re: Strange C developments Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-07-24 01:57 -0700
              Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-09-07 11:20 -0700
      Re: Strange C developments Tim Rentsch <txr@alumni.caltech.edu> - 2012-07-21 15:13 -0700
  Re: Strange C developments John Bode <jfbode1029@gmail.com> - 2012-07-23 14:59 -0700

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