Re: Array allocated on stack or heap

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.lang.c
Subject	Re: Array allocated on stack or heap
Date	2017-03-17 21:01 +0100
Organization	A noiseless patient Spider
Message-ID	<oahf4s$55b$1@dont-email.me> (permalink)
References	<c2cde792-fb27-45a4-b422-0440077ac0f1@googlegroups.com> <faad0787-be77-4403-a140-0a42613df92b@googlegroups.com> <oahe6s$1b6$1@dont-email.me>

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On 17/03/17 20:45, jacobnavia wrote:
> Le 17/03/2017 à 20:15, John Bode a écrit :
>> The real-world implementations I know of would try to place it on the
>> runtime stack, but that's strictly a function of the implementation, not
>> the language definition.  All the language definition specifies is *when*
>> and for how long memory is to be set aside for the object, not *where*.
>
> The language definition defines a logical stack of nested scopes.
>
> You enter a scope and push the old contents of the workspace to make
> place for a new scope with new data. You do your calculations and exit
> the scope with (or without) result. You pop the old context and you
> continue.
>
> You can enter a scope and exit it in a stack-like manner. Now, it is
> obvious since almost all CPUs have a machine stack, that the best thing
> to do is to implement the C stack using the machine's stack pointer.
>
> Obviously.
>
> I never thought somebody would discuss such obvious facts.
>
> The C language does imply a stack, and most implementations use the
> machine stack since it is built for doing exactly that: a stack.
>
>

The key word here is "most".  Yes, /most/ implementations use a machine 
stack.  But some, especially for small microcontrollers, do not - or at 
least, the avoid using a stack as much as possible.  I have also used 
implementations where there were two stacks - one was used for function 
return addresses and temporary storage of registers (push and pop 
instructions), the other was used for a stack frame for local variables.

The C standards covers a wider range of implementations than just 
"most", and also applies to unusual or limited architectures.

Thread

Array allocated on stack or heap Prashant Shah <pshah.mumbai@gmail.com> - 2017-03-16 22:58 -0700
  Re: Array allocated on stack or heap Barry Schwarz <schwarzb@dqel.com> - 2017-03-16 23:57 -0700
    Re: Array allocated on stack or heap Mark Storkamp <mstorkamp@yahoo.com> - 2017-03-17 12:44 -0500
      Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-17 11:26 -0700
        Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-17 20:38 +0100
          Re: Array allocated on stack or heap Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-17 16:08 -0400
            Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-18 00:03 +0100
              Re: Array allocated on stack or heap Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-17 20:54 -0400
  Re: Array allocated on stack or heap John Bode <jfbode1029@gmail.com> - 2017-03-17 12:15 -0700
    Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-17 20:22 +0100
    Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-17 20:45 +0100
      Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-17 12:59 -0700
      Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-17 21:01 +0100
        Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-18 00:12 +0100
          Re: Array allocated on stack or heap jameskuyper@verizon.net - 2017-03-17 16:25 -0700
            Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-17 17:08 -0700
              Re: Array allocated on stack or heap Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-17 17:37 -0700
          Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-19 12:30 +0100
            Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 12:12 +0000
              Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-19 13:52 +0100
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 16:51 +0000
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-20 10:44 +0100
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-20 12:01 +0000
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-20 06:02 -0700
                Re: Array allocated on stack or heap GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-20 14:54 +0100
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-20 07:28 -0700
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-20 16:43 +0100
                Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-20 09:02 -0700
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-21 10:11 +0100
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-21 02:48 -0700
                Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-21 08:19 -0700
                Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-21 08:17 -0700
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-21 09:06 -0700
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-21 17:32 +0100
                Re: Array allocated on stack or heap Les Cargill <lcargill99@comcast.com> - 2017-03-25 15:14 -0500
                Re: Array allocated on stack or heap Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-25 16:05 -0700
                Re: Array allocated on stack or heap Les Cargill <lcargill99@comcast.com> - 2017-03-25 23:53 -0500
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-26 12:30 +0100
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-26 14:09 -0700
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-26 22:17 +0100
                Re: Array allocated on stack or heap Robert Wessel <robertwessel2@yahoo.com> - 2017-03-26 21:52 -0500
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-27 13:06 +0100
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-27 10:10 -0700
                Re: Array allocated on stack or heap Robert Wessel <robertwessel2@yahoo.com> - 2017-03-27 15:56 -0500
                Re: Array allocated on stack or heap bartc <bc@freeuk.com> - 2017-03-27 22:48 +0100
                Re: Array allocated on stack or heap Robert Wessel <robertwessel2@yahoo.com> - 2017-03-27 19:58 -0500
                Re: Array allocated on stack or heap GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-20 14:56 +0100
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-20 15:34 +0100
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-20 09:28 -0700
                Re: Array allocated on stack or heap bart4858@gmail.com - 2017-03-20 13:05 -0700
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-20 13:53 -0700
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-20 14:26 -0700
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-20 22:24 +0000
                Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-20 15:44 -0700
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-21 02:44 -0700
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-21 11:15 +0100
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-21 11:12 +0000
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-21 04:23 -0700
                Re: Array allocated on stack or heap scott@slp53.sl.home (Scott Lurndal) - 2017-03-21 13:13 +0000
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-21 13:38 +0000
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-21 15:33 +0100
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-21 07:38 -0700
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-21 07:35 -0700
                Re: Array allocated on stack or heap scott@slp53.sl.home (Scott Lurndal) - 2017-03-21 15:09 +0000
              Re: Array allocated on stack or heap Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-19 13:05 +0000
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 13:27 +0000
                Re: Array allocated on stack or heap GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-19 14:26 +0100
                Re: Array allocated on stack or heap Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-19 13:34 +0000
                Re: Array allocated on stack or heap GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-19 14:35 +0100
                Re: Array allocated on stack or heap Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-19 13:36 +0000
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 14:00 +0000
                Re: Array allocated on stack or heap Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-19 19:00 +0000
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 19:24 +0000
                Re: Array allocated on stack or heap Ian Collins <ian-news@hotmail.com> - 2017-03-20 08:45 +1300
                Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-19 14:32 -0700
                Re: Array allocated on stack or heap Ian Collins <ian-news@hotmail.com> - 2017-03-20 16:16 +1300
                Re: Array allocated on stack or heap Gareth Owen <gwowen@gmail.com> - 2017-03-20 18:58 +0000
                Re: Array allocated on stack or heap raltbos@xs4all.nl (Richard Bos) - 2017-03-24 09:17 +0000
                Re: Array allocated on stack or heap Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-19 20:50 +0000
              Re: Array allocated on stack or heap GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-19 14:10 +0100
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 13:38 +0000
                Re: Array allocated on stack or heap GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-19 14:49 +0100
                Re: Array allocated on stack or heap luser droog <luser.droog@gmail.com> - 2017-03-20 07:59 -0700
              Re: Array allocated on stack or heap Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-19 10:57 -0400
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 16:14 +0000
                Re: Array allocated on stack or heap Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-19 15:53 -0400
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 20:37 +0000
                Re: Array allocated on stack or heap Jean-Marc Bourguet <jm@bourguet.org> - 2017-03-19 23:09 +0100
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 22:38 +0000
                Re: Array allocated on stack or heap Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-03-19 16:21 -0700
                Re: Array allocated on stack or heap Ian Collins <ian-news@hotmail.com> - 2017-03-20 16:18 +1300
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-20 11:06 +0100
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-20 11:00 +0100
              Re: Array allocated on stack or heap supercat@casperkitty.com - 2017-03-19 08:53 -0700
      Re: Array allocated on stack or heap Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-17 16:11 -0400
      Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-17 13:35 -0700
        Re: Array allocated on stack or heap Chad <cdalten@gmail.com> - 2017-03-17 14:00 -0700
          Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-17 23:57 +0100
            Re: Array allocated on stack or heap Ian Collins <ian-news@hotmail.com> - 2017-03-18 12:42 +1300
              Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-18 00:45 +0100
            Re: Array allocated on stack or heap Chad <cdalten@gmail.com> - 2017-03-18 14:17 -0700
              Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-19 19:21 +0100
                Re: Array allocated on stack or heap already5chosen@yahoo.com - 2017-03-19 15:00 -0700
                Re: Array allocated on stack or heap BartC <bc@freeuk.com> - 2017-03-19 22:16 +0000
                Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-19 23:57 +0100
                Re: Array allocated on stack or heap Keith Thompson <kst-u@mib.org> - 2017-03-19 16:15 -0700
                Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-20 12:24 +0100
                Re: Array allocated on stack or heap scott@slp53.sl.home (Scott Lurndal) - 2017-03-20 13:24 +0000
            Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-19 13:21 +0100
      Re: Array allocated on stack or heap John Bode <jfbode1029@gmail.com> - 2017-03-17 14:30 -0700
        Re: Array allocated on stack or heap jacobnavia <jacob@jacob.remcomp.fr> - 2017-03-17 23:59 +0100
        Re: Array allocated on stack or heap Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-17 21:02 -0400
        Re: Array allocated on stack or heap David Brown <david.brown@hesbynett.no> - 2017-03-19 13:26 +0100

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