Re: Development Best Practices and C "nomenclature"

From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.c
Subject	Re: Development Best Practices and C "nomenclature"
Date	2015-11-17 20:12 +0000
Organization	Aioe.org NNTP Server
Message-ID	<n2g1ms$3m2$1@speranza.aioe.org> (permalink)
References	(6 earlier) <e12bd800-8ea5-4b67-bee9-5dc5e810f5f4@googlegroups.com> <17264e2f-0e67-412e-800d-d23c4e300d42@googlegroups.com> <n2d9uf$1od$1@speranza.aioe.org> <n2eqci$9gc$1@dont-email.me> <lnmvuck1m6.fsf@kst-u.example.com>

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Keith Thompson <kst-u@mib.org> wrote:
> David Brown <david.brown@hesbynett.no> writes:
> [...]
>> Names are not used in the generated object code (unless you use
>> "__func__" in gcc or some other way of adding function names to the
>> code).  Names will be included in linkable object files for linkage,
>> debugging information, etc., but they are not used in the final linked
>> machine code that is run.

> It depends.  Symbols that are visible to the linker may be included in
> the executable file.  On Unix-like systems, run "nm" to see what symbols
> are included.  These symbols may be stripped out, or not included in the
> first place, depending on how you invoke the linker.  But (as I
> understand it) they're not generally loaded into memory when you run the
> program.  (Things may or may not be similar on non-Unix-like systems.)

The OS/360 (and successor) linkage editor can read its own output.

At the time OS/360 was being developed, compilers were slow.
They wanted the ability to recompile only procedures that changed,
and replace those in a previously linked program. That is where
the name linkage editor comes from.  There is a simple rule that
if two CSECTs with the same name appear, the first one is used.
Put all the new ones into the input INCLUDE (linkage editor
control card) the old load module, and write out the new one.

The ESD (external symbol dictionary) isn't all that big, and is
ignored when reading one in to execute. 

In addition, it is usual for OS/360 compilers (and assembly 
programmers) to put the name at the beginning of each ENTRY
(assembler instruction) point with a branch around it. 
Traceback routines and debuggers know where to find them, and
print them out. 

OS/360, and still with z/OS, uses a doubly linked list for
linkage instead of a stack, which sometimes makes it easier
to do tracebacks.

-- glen

Thread

Array manipulation techniques "Morten W. Petersen" <morphex@gmail.com> - 2015-11-15 09:44 +0100
  Re: Array manipulation techniques Barry Schwarz <schwarzb@dqel.com> - 2015-11-15 01:56 -0800
    Re: Array manipulation techniques Keith Thompson <kst-u@mib.org> - 2015-11-15 10:43 -0800
      Re: Array manipulation techniques Chad <cdalten@gmail.com> - 2015-11-15 10:54 -0800
        Re: Array manipulation techniques Ian Collins <ian-news@hotmail.com> - 2015-11-16 08:13 +1300
          Re: Array manipulation techniques Chad <cdalten@gmail.com> - 2015-11-15 12:50 -0800
        Re: Array manipulation techniques Les Cargill <lcargill99@comcast.com> - 2015-11-15 14:07 -0600
      Re: Array manipulation techniques Barry Schwarz <schwarzb@dqel.com> - 2015-11-15 15:12 -0800
  Re: Array manipulation techniques glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-15 09:57 +0000
  Re: Array manipulation techniques Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-15 03:02 -0800
  Array manipulation techniques asetofsymbols@gmail.com - 2015-11-15 12:02 -0800
    Array manipulation techniques asetofsymbols@gmail.com - 2015-11-15 12:05 -0800
      Array manipulation techniques asetofsymbols@gmail.com - 2015-11-15 12:28 -0800
        Re: Array manipulation techniques Chad <cdalten@gmail.com> - 2015-11-15 12:48 -0800
        Re: Array manipulation techniques Geoff <geoff@invalid.invalid> - 2015-11-15 17:05 -0800
          Re: Array manipulation techniques Keith Thompson <kst-u@mib.org> - 2015-11-15 19:09 -0800
          Re: Array manipulation techniques asetofsymbols@gmail.com - 2015-11-15 22:52 -0800
            Re: Array manipulation techniques asetofsymbols@gmail.com - 2015-11-15 23:00 -0800
              Re: Array manipulation techniques Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 07:17 +0000
                Re: Array manipulation techniques asetofsymbols@gmail.com - 2015-11-15 23:41 -0800
                Re: Array manipulation techniques Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 07:47 +0000
                Re: Array manipulation techniques David Brown <david.brown@hesbynett.no> - 2015-11-16 09:51 +0100
                Re: Array manipulation techniques Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 16:49 +0000
                Re: Array manipulation techniques BartC <bc@freeuk.com> - 2015-11-16 11:10 +0000
                Re: Array manipulation techniques Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-16 03:33 -0800
                Re: Array manipulation techniques Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-16 13:09 +0000
                Re: Array manipulation techniques Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-16 05:59 -0800
                Re: Array manipulation techniques Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-16 15:22 +0000
                Re: Array manipulation techniques Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 16:57 +0000
                Re: Array manipulation techniques Keith Thompson <kst-u@mib.org> - 2015-11-16 10:29 -0800
                Re: Array manipulation techniques David Brown <david.brown@hesbynett.no> - 2015-11-17 09:02 +0100
                Re: Array manipulation techniques BartC <bc@freeuk.com> - 2015-11-17 10:46 +0000
                Re: Array manipulation techniques Keith Thompson <kst-u@mib.org> - 2015-11-17 07:05 -0800
                Re: Array manipulation techniques David Brown <david.brown@hesbynett.no> - 2015-11-17 16:47 +0100
                Re: Array manipulation techniques supercat@casperkitty.com - 2015-11-17 12:33 -0800
              Development Best Practices and C "nomenclature" Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-11-16 12:15 -0500
                Re: Development Best Practices and C "nomenclature" Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-16 10:33 -0800
                Re: Development Best Practices and C "nomenclature" asetofsymbols@gmail.com - 2015-11-16 10:51 -0800
                Re: Development Best Practices and C "nomenclature" "Morten W. Petersen" <morphex@gmail.com> - 2015-11-16 20:14 +0100
                Re: Development Best Practices and C "nomenclature" asetofsymbols@gmail.com - 2015-11-16 11:28 -0800
                Re: Development Best Practices and C "nomenclature" "Morten W. Petersen" <morphex@gmail.com> - 2015-11-17 00:20 +0100
                Re: Development Best Practices and C "nomenclature" David Brown <david.brown@hesbynett.no> - 2015-11-17 10:03 +0100
                Re: Development Best Practices and C "nomenclature" Keith Thompson <kst-u@mib.org> - 2015-11-17 08:54 -0800
                Re: Development Best Practices and C "nomenclature" glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-17 20:12 +0000
                Re: Development Best Practices and C "nomenclature" Robert Wessel <robertwessel2@yahoo.com> - 2015-11-17 23:38 -0600
                Re: Development Best Practices and C "nomenclature" glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-18 08:22 +0000
                Re: Development Best Practices and C "nomenclature" Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 20:25 +0000
                Re: Development Best Practices and C "nomenclature" Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-11-16 16:20 -0500
                Re: Development Best Practices and C "nomenclature" Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-16 13:28 -0800
                Re: Development Best Practices and C "nomenclature" Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 21:30 +0000
                Re: Development Best Practices and C "nomenclature" asetofsymbols@gmail.com - 2015-11-16 14:38 -0800
                Re: Development Best Practices and C "nomenclature" asetofsymbols@gmail.com - 2015-11-16 14:52 -0800
                Re: Development Best Practices and C "nomenclature" asetofsymbols@gmail.com - 2015-11-17 22:51 -0800
                Re: Development Best Practices and C "nomenclature" Richard Heathfield <rjh@cpax.org.uk> - 2015-11-18 06:59 +0000
                Re: Development Best Practices and C "nomenclature" Richard Heathfield <rjh@cpax.org.uk> - 2015-11-16 20:24 +0000
                Re: Development Best Practices and C "nomenclature" David Brown <david.brown@hesbynett.no> - 2015-11-17 09:55 +0100
                Re: Development Best Practices and C "nomenclature" raltbos@xs4all.nl (Richard Bos) - 2015-11-17 23:00 +0000
                Re: Development Best Practices and C "nomenclature" raltbos@xs4all.nl (Richard Bos) - 2015-11-17 22:55 +0000
                Re: Development Best Practices and C "nomenclature" Ian Collins <ian-news@hotmail.com> - 2015-11-18 12:07 +1300
                Re: Development Best Practices and C "nomenclature" James Kuyper <jameskuyper@verizon.net> - 2015-11-17 18:45 -0500
                Re: Development Best Practices and C "nomenclature" David Brown <david.brown@hesbynett.no> - 2015-11-18 15:50 +0100
                Re: Development Best Practices and C "nomenclature" Keith Thompson <kst-u@mib.org> - 2015-11-18 08:39 -0800
                Re: Development Best Practices and C "nomenclature" Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-20 13:07 -0800
                Re: Development Best Practices and C "nomenclature" Keith Thompson <kst-u@mib.org> - 2015-11-20 14:16 -0800
                [OT] Re: Development Best Practices and C "nomenclature" Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-20 17:30 -0500
                Re: [OT] Re: Development Best Practices and C "nomenclature" Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-20 19:29 -0800
                Re: [OT] Re: Development Best Practices and C "nomenclature" raltbos@xs4all.nl (Richard Bos) - 2015-11-21 22:44 +0000
                Re: Development Best Practices and C "nomenclature" jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-22 00:09 +0100
                Re: Development Best Practices and C "nomenclature" Keith Thompson <kst-u@mib.org> - 2015-11-21 15:57 -0800
                Re: Development Best Practices and C "nomenclature" James Kuyper <jameskuyper@verizon.net> - 2015-11-21 20:49 -0500
                Re: Development Best Practices and C "nomenclature" Rosario19 <Ros@invalid.invalid> - 2015-11-25 10:13 +0100
                Re: Development Best Practices and C "nomenclature" "J. Clarke" <j.clarke.873638@gmail.com> - 2015-11-25 18:58 -0500
                Re: Development Best Practices and C "nomenclature" Rosario19 <Ros@invalid.invalid> - 2015-11-26 12:13 +0100
                Re: Development Best Practices and C "nomenclature" "J. Clarke" <j.clarke.873638@gmail.com> - 2015-11-26 07:22 -0500
                Re: Development Best Practices and C "nomenclature" glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-22 14:51 +0000
                Re: Development Best Practices and C "nomenclature" "Charles Richmond" <numerist@aquaporin4.com> - 2015-11-23 15:53 -0600
                Re: Development Best Practices and C "nomenclature" Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-18 08:55 -0800
                Re: Development Best Practices and C "nomenclature" Keith Thompson <kst-u@mib.org> - 2015-11-18 09:17 -0800
                Re: Development Best Practices and C "nomenclature" James Kuyper <jameskuyper@verizon.net> - 2015-11-18 13:19 -0500
                Re: Development Best Practices and C "nomenclature" raltbos@xs4all.nl (Richard Bos) - 2015-11-20 11:32 +0000
                Re: Development Best Practices and C "nomenclature" Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-20 13:17 -0800
                Re: Development Best Practices and C "nomenclature" glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-21 07:08 +0000
                Re: Development Best Practices and C "nomenclature" Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-22 13:52 -0800
      Re: Array manipulation techniques Geoff <geoff@invalid.invalid> - 2015-11-15 17:03 -0800
    Re: Array manipulation techniques Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-15 15:09 -0500
    Re: Array manipulation techniques Richard Heathfield <rjh@cpax.org.uk> - 2015-11-15 21:47 +0000
    Re: Array manipulation techniques Geoff <geoff@invalid.invalid> - 2015-11-15 17:02 -0800
    Re: Array manipulation techniques Keith Thompson <kst-u@mib.org> - 2015-11-16 10:44 -0800
      Re: Array manipulation techniques asetofsymbols@gmail.com - 2015-11-16 11:13 -0800
        Re: Array manipulation techniques Keith Thompson <kst-u@mib.org> - 2015-11-16 11:57 -0800
          Re: Array manipulation techniques Ian Collins <ian-news@hotmail.com> - 2015-11-17 10:30 +1300
        Re: Array manipulation techniques Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-17 08:11 -0500
          Re: Array manipulation techniques BartC <bc@freeuk.com> - 2015-11-17 13:24 +0000
          Re: Array manipulation techniques Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-20 13:09 -0800
            Re: Array manipulation techniques Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-20 16:20 -0500

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