Re: C++ source code compilation

From	88888 Dihedral <dihedral88888@googlemail.com>
Newsgroups	comp.lang.c++
Subject	Re: C++ source code compilation
Date	2011-12-07 11:04 -0800
Organization	http://groups.google.com
Message-ID	<17863313.475.1323284650416.JavaMail.geo-discussion-forums@pril5> (permalink)
References	<ebe43093-5bbb-4a73-a059-b7c51db1a3a8@l24g2000yqm.googlegroups.com> <-66dnSWxcIcy1kPTnZ2dnUVZ8sOdnZ2d@giganews.com> <4edf181e$0$2821$7b1e8fa0@news.nbl.fi> <jbo896$2pf3$1@adenine.netfront.net> <3iavd7teopcqd2ar846trba102n1a3q27n@4ax.com>

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On Thursday, December 8, 2011 2:28:29 AM UTC+8, ralph wrote:
> On Wed, 7 Dec 2011 17:37:14 -0000, "Paul"
> 
> o...@yahoo.co.uk> wrote:
> 
> >
> >"Juha Nieminen" <nospam@thanks.invalid> wrote in message 
> >news:4edf181e$0$2821$7b1e8fa0@news.nbl.fi...
> >> Leigh Johnston <le...@i42.co.uk> wrote:
> >>> On 06/12/2011 16:49, Sheky wrote:
> >>>> Could anyone please answer if every C++ programs get converted to
> >>>> equivalent C code during compilation ? Thank you.
> >>>
> >>> Some early C++ compilers worked this way but I suspect very few modern
> >>> C++ compilers produce C as an intermediate but rather create machine
> >>> code directly.
> >>
> >>  Actually compilers, especially those supporting many languages (such as
> >> gcc) probably produce a kind of "intermediate" form (which is more or less
> >> common to all the languages that the compiler supports), which is then
> >> optimized and compiled into asm. (This intermediate form isn't a 
> >> programming
> >> language per se, but usually some tokenized and "half-compiled" tree data 
> >> in
> >> binary form, or similar.)
> >
> >Are you suggesting that C++ compilers convert the code to asm, then this asm 
> >code is convert to object code?
> >

What the byte code compiler in C++ and C are different?

That is funny at all. A tree pass compiler in C++/C with local limited  optimization only and can't be inserted with assembly code directly 
is weired. 

Objects are just decorated syntax sugars for structures and function pointers
as stated  clearly in the FAQ in this news group. 


 
> Not exactly what he is suggesting, but in process of compiling by
> mainstream compilers (GCC, VC++, Borland, ...) there is a step in
> which preprocessed C++ code is converted to assembly. The assembler
> then converts the 'asm' code into object code.
> 
> >>
> >>  Anyways, converting a C++ program into C and then compiling that C would
> >> be inefficient, complicated and produce a less efficient result (because
> >> the compiler cannot use its knowledge of the C++ syntax in order to better
> >> optimize the code), so it would make little sense.
> >>
> >>  (As an example, I'm guessing that exception handling is impossible to
> >> convert into C code so that it would be as efficient as when compiling
> >> C++ directly. C++ exceptions are designed so that if no exception is
> >> thrown, the code will be as efficient as if no exceptions were in use
> >> at all. I think this would be impossible to express in C.)
> >
> >Would the same not apply with asm?
> >
> 
> Not really. Or rather there is no asm that couldn't be
> reverse-engineered back into an equivalent expression in another
> higher-level language.
> 
> Thus while performing a C++ to C conversion at the source code level
> would likely lead to a complete mental collapse, a C++ to asm then asm
> to C would be doable - though definitely non-trivial.
> 
> -ralph

Thread

C++ source code compilation Sheky <shekhar07.nitdgp@gmail.com> - 2011-12-06 08:49 -0800
  Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-06 17:06 +0000
    Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-07 07:39 +0000
      Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-07 14:11 +0000
      Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-07 17:37 +0000
        Re: C++ source code compilation ralph <nt_consulting64@yahoo.net> - 2011-12-07 12:28 -0600
          Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-07 11:04 -0800
          Re: C++ source code compilation Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-12-07 19:53 +0000
            Re: C++ source code compilation Rui Maciel <rui.maciel@gmail.com> - 2011-12-07 20:41 +0000
              Re: C++ source code compilation Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-12-08 19:48 +0000
          Re: C++ source code compilation Robert Wessel <robertwessel2@yahoo.com> - 2011-12-07 14:56 -0600
            Re: C++ source code compilation ralph <nt_consulting64@yahoo.net> - 2011-12-07 16:09 -0600
          Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-07 22:27 +0000
            Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-08 09:28 +0000
              Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 13:39 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 06:26 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 10:55 +0000
          Re: C++ source code compilation Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-08 03:41 -0800
            Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 13:42 +0000
              Re: C++ source code compilation Rui Maciel <rui.maciel@gmail.com> - 2011-12-08 13:56 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 14:11 +0000
                Re: C++ source code compilation Rui Maciel <rui.maciel@gmail.com> - 2011-12-08 14:21 +0000
                Re: C++ source code compilation gwowen <gwowen@gmail.com> - 2011-12-08 08:38 -0800
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 00:39 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 00:31 +0000
                Re: C++ source code compilation Rui Maciel <rui.maciel@gmail.com> - 2011-12-09 12:12 +0000
                Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-08 08:56 -0800
              Re: C++ source code compilation Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-09 05:23 -0800
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 14:16 +0000
            Re: C++ source code compilation ralph <nt_consulting64@yahoo.net> - 2011-12-08 08:02 -0600
              Re: C++ source code compilation Robert Wessel <robertwessel2@yahoo.com> - 2011-12-08 13:18 -0600
                Re: C++ source code compilation ralph <nt_consulting64@yahoo.net> - 2011-12-09 11:43 -0600
                Re: C++ source code compilation Robert Wessel <robertwessel2@yahoo.com> - 2011-12-09 17:24 -0600
                Re: C++ source code compilation ralph <nt_consulting64@yahoo.net> - 2011-12-09 18:06 -0600
    Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-07 17:39 +0000
      Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-07 18:02 +0000
        Re: C++ source code compilation Robert Wessel <robertwessel2@yahoo.com> - 2011-12-07 14:58 -0600
        Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-07 22:20 +0000
          Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-07 22:42 +0000
            Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 01:54 +0000
          Re: C++ source code compilation John Bokma <john@castleamber.com> - 2011-12-07 16:55 -0600
            Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-07 22:58 +0000
              Re: C++ source code compilation John Bokma <john@castleamber.com> - 2011-12-07 20:52 -0600
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 05:09 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 05:15 +0000
                Re: C++ source code compilation John Bokma <john@castleamber.com> - 2011-12-08 11:37 -0600
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 00:45 +0000
                Re: C++ source code compilation Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-12-10 21:46 +0000
                Re: C++ source code compilation Dombo <dombo@disposable.invalid> - 2011-12-11 16:01 +0100
            Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 01:59 +0000
              Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-08 09:35 +0000
                Re: C++ source code compilation Paavo Helde <myfirstname@osa.pri.ee> - 2011-12-08 12:43 -0600
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 06:31 +0000
                Re: C++ source code compilation Ian Collins <ian-news@hotmail.com> - 2011-12-09 19:40 +1300
                Re: C++ source code compilation gwowen <gwowen@gmail.com> - 2011-12-08 23:47 -0800
                Re: C++ source code compilation Paavo Helde <myfirstname@osa.pri.ee> - 2011-12-09 02:29 -0600
                Re: C++ source code compilation Tobias Müller <troplin@bluewin.ch> - 2011-12-09 07:23 +0000
                Re: C++ source code compilation gwowen <gwowen@gmail.com> - 2011-12-08 23:46 -0800
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 09:24 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 11:01 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 12:23 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 10:58 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 12:35 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 12:44 +0000
                Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-09 04:55 -0800
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 14:20 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-09 14:33 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 14:58 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 15:11 +0000
                Re: C++ source code compilation Ian Collins <ian-news@hotmail.com> - 2011-12-10 07:59 +1300
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-09 15:09 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 19:36 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-09 19:53 +0000
                Re: C++ source code compilation Ian Collins <ian-news@hotmail.com> - 2011-12-10 10:03 +1300
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-09 21:10 +0000
                Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-09 14:06 -0800
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 23:04 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 23:15 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-09 23:37 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 01:51 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-10 09:51 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 13:50 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-11 08:53 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-11 20:17 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 12:37 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 13:45 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-10 13:49 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 14:37 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-11 08:55 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 14:07 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 14:28 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 14:50 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 14:54 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 15:17 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 18:13 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 18:36 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 22:34 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 22:46 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 23:25 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-10 23:30 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-11 03:23 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-11 09:12 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-12 10:05 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-12 12:05 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-12 12:58 +0000
                Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-11 13:29 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-11 20:33 +0000
                Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-11 07:14 -0800
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-11 09:07 +0000
                Re: C++ source code compilation Tobias Müller <troplin@bluewin.ch> - 2011-12-10 14:52 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-10 15:24 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-11 09:05 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-11 09:01 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-11 20:22 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-12 10:11 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 15:08 +0000
                Re: C++ source code compilation Rui Maciel <rui.maciel@gmail.com> - 2011-12-09 15:08 +0000
              Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-08 02:53 -0800
                Re: C++ source code compilation Robert Wessel <robertwessel2@yahoo.com> - 2011-12-08 05:16 -0600
                Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-08 03:50 -0800
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-08 14:01 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 06:35 +0000
                Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-09 11:06 +0000
                Re: C++ source code compilation Juha Nieminen <nospam@thanks.invalid> - 2011-12-09 12:38 +0000
          Re: C++ source code compilation Paul N <gw7rib@aol.com> - 2011-12-11 12:41 -0800
            Re: C++ source code compilation Leigh Johnston <leigh@i42.co.uk> - 2011-12-11 21:02 +0000
            Re: C++ source code compilation "Paul" <pchrist<nospam>or@yahoo.co.uk> - 2011-12-12 02:19 +0000
              Re: C++ source code compilation 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-11 20:02 -0800
  Re: C++ source code compilation red floyd <no.spam.here@its.invalid> - 2011-12-06 09:15 -0800
    Re: C++ source code compilation Sheky <shekhar07.nitdgp@gmail.com> - 2011-12-06 10:29 -0800
      Re: C++ source code compilation Robert Wessel <robertwessel2@yahoo.com> - 2011-12-06 12:39 -0600
        Re: C++ source code compilation Victor Bazarov <v.bazarov@comcast.invalid> - 2011-12-06 13:51 -0500
  Re: C++ source code compilation Paul N <gw7rib@aol.com> - 2011-12-06 14:47 -0800

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