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digitalmars.D.learn - About demangling

reply Lubos Pintes <lubos.pintes gmail.com> writes:
Hi,
Can someone point me to some source with information about name 
demangling when compiling some D program and the famous linker error 42 
appears?
Thank
Oct 11 2012
next sibling parent Jacob Carlborg <doob me.com> writes:
On 2012-10-11 15:17, Lubos Pintes wrote:

 Hi,
 Can someone point me to some source with information about name
 demangling when compiling some D program and the famous linker error 42
 appears?
 Thank


This page contains the reference for the name mangling:

http://dlang.org/abi.html

-- 
/Jacob Carlborg
Oct 11 2012
prev sibling parent reply Sean Kelly <sean invisibleduck.org> writes:
On Oct 11, 2012, at 6:17 AM, Lubos Pintes <lubos.pintes gmail.com> =
wrote:


 Hi,
 Can someone point me to some source with information about name =


demangling when compiling some D program and the famous linker error 42 =
appears?

Filter the symbol names through core.demangle.
Oct 11 2012
parent reply =?UTF-8?B?QWxleCBSw7hubmUgUGV0ZXJzZW4=?= <alex lycus.org> writes:
On 11-10-2012 22:56, Sean Kelly wrote:

 On Oct 11, 2012, at 6:17 AM, Lubos Pintes <lubos.pintes gmail.com> wrote:


 Hi,
 Can someone point me to some source with information about name demangling
when compiling some D program and the famous linker error 42 appears?


 Filter the symbol names through core.demangle.


We even have a tool for that: 
https://github.com/D-Programming-Language/tools/blob/master/ddemangle.d

-- 
Alex Rønne Petersen
alex lycus.org
http://lycus.org
Oct 11 2012
parent reply "Dan" <dbdavidson yahoo.com> writes:
On Thursday, 11 October 2012 at 21:04:28 UTC, Alex Rønne 
Petersen wrote:

 On 11-10-2012 22:56, Sean Kelly wrote:

 On Oct 11, 2012, at 6:17 AM, Lubos Pintes 
 <lubos.pintes gmail.com> wrote:


 Hi,
 Can someone point me to some source with information about 
 name demangling when compiling some D program and the famous 
 linker error 42 appears?


 Filter the symbol names through core.demangle.


 We even have a tool for that: 
 https://github.com/D-Programming-Language/tools/blob/master/ddemangle.d


Does this work and if so how? I've seen a thread about the 
demangling tool not working on types, just functions. The comment 
at top of this file says
"Replaces *all* occurrences of mangled D symbols in the input..." 
so I assume it deals with types? The help says: 'If <inputfile> 
is a single dash '-', standard input is read.'

I've tried:
$ echo "this & 
_D56TypeInfo_xS8plusauri6bsheet13balance_sheet12BalanceSheet6__initZ 
unq & 
_D55TypeInfo_S8plusauri6bsheet13balance_sheet12BalanceSheet6__initZ" 

 ./goo.txt


$ ./ddmangle ./goo.txt

which just hangs, and this - which does not demangle:

$ echo "this & 
_D56TypeInfo_xS8plusauri6bsheet13balance_sheet12BalanceSheet6__initZ 
unq & 
_D55TypeInfo_S8plusauri6bsheet13balance_sheet12BalanceSheet6__initZ" 
| ./ddmangle
this & 
_D56TypeInfo_xS8plusauri6bsheet13balance_sheet12BalanceSheet6__initZ 
unq & 
_D55TypeInfo_S8plusauri6bsheet13balance_sheet12BalanceSheet6__initZ

What is the correct way to do this?

Thanks
Dan
Nov 01 2012
next sibling parent reply "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Thu, Nov 01, 2012 at 03:16:25PM +0100, Dan wrote:

 On Thursday, 11 October 2012 at 21:04:28 UTC, Alex Rønne Petersen
 wrote:

On 11-10-2012 22:56, Sean Kelly wrote:

On Oct 11, 2012, at 6:17 AM, Lubos Pintes
<lubos.pintes gmail.com> wrote:


Hi,
Can someone point me to some source with information about
name demangling when compiling some D program and the famous
linker error 42 appears?


Filter the symbol names through core.demangle.


We even have a tool for that:
https://github.com/D-Programming-Language/tools/blob/master/ddemangle.d


 
 Does this work and if so how? I've seen a thread about the demangling
 tool not working on types, just functions. The comment at top of this
 file says "Replaces *all* occurrences of mangled D symbols in the
 input..." so I assume it deals with types? The help says: 'If
 <inputfile> is a single dash '-', standard input is read.'


[...]

This program only calls the library core.demangle. So if core.demangle
doesn't demangle something, then it won't get demangled. The problem is,
there's a comment in core.demangle that seems to say that some mangled
symbols are skipped because they are not pertinent to the ABI, or
something to that effect. Meaning that *not* all symbols are getting
demangled.

I think this should be an enhancement request in the bugtracker.


T

-- 
Let's call it an accidental feature. -- Larry Wall
Nov 01 2012
next sibling parent "Regan Heath" <regan netmail.co.nz> writes:
On Thu, 01 Nov 2012 15:40:23 -0000, H. S. Teoh <hsteoh quickfur.ath.cx> =
 =

wrote:


 On Thu, Nov 01, 2012 at 03:16:25PM +0100, Dan wrote:

 On Thursday, 11 October 2012 at 21:04:28 UTC, Alex R=F8nne Petersen
 wrote:

On 11-10-2012 22:56, Sean Kelly wrote:

On Oct 11, 2012, at 6:17 AM, Lubos Pintes
<lubos.pintes gmail.com> wrote:


Hi,
Can someone point me to some source with information about
name demangling when compiling some D program and the famous
linker error 42 appears?


Filter the symbol names through core.demangle.


We even have a tool for that:
https://github.com/D-Programming-Language/tools/blob/master/ddemangl=






e.d

 Does this work and if so how? I've seen a thread about the demangling=





 tool not working on types, just functions. The comment at top of this=





 file says "Replaces *all* occurrences of mangled D symbols in the
 input..." so I assume it deals with types? The help says: 'If
 <inputfile> is a single dash '-', standard input is read.'


 [...]

 This program only calls the library core.demangle. So if core.demangle=



 doesn't demangle something, then it won't get demangled. The problem i=


s,

 there's a comment in core.demangle that seems to say that some mangled=



 symbols are skipped because they are not pertinent to the ABI, or
 something to that effect. Meaning that *not* all symbols are getting
 demangled.

 I think this should be an enhancement request in the bugtracker.


There is also a bug in demangle.d, line 55:

foreach (line; stdin.byLine())

should read:

foreach (line; f.byLine())

R

-- =

Using Opera's revolutionary email client: http://www.opera.com/mail/
Nov 01 2012
prev sibling parent reply "Regan Heath" <regan netmail.co.nz> writes:
On Thu, 01 Nov 2012 15:40:23 -0000, H. S. Teoh <hsteoh quickfur.ath.cx> =
 =

wrote:


 On Thu, Nov 01, 2012 at 03:16:25PM +0100, Dan wrote:

 On Thursday, 11 October 2012 at 21:04:28 UTC, Alex R=F8nne Petersen
 wrote:

On 11-10-2012 22:56, Sean Kelly wrote:

On Oct 11, 2012, at 6:17 AM, Lubos Pintes
<lubos.pintes gmail.com> wrote:


Hi,
Can someone point me to some source with information about
name demangling when compiling some D program and the famous
linker error 42 appears?


Filter the symbol names through core.demangle.


We even have a tool for that:
https://github.com/D-Programming-Language/tools/blob/master/ddemangl=






e.d

 Does this work and if so how? I've seen a thread about the demangling=





 tool not working on types, just functions. The comment at top of this=





 file says "Replaces *all* occurrences of mangled D symbols in the
 input..." so I assume it deals with types? The help says: 'If
 <inputfile> is a single dash '-', standard input is read.'


 [...]

 This program only calls the library core.demangle. So if core.demangle=



 doesn't demangle something, then it won't get demangled. The problem i=


s,

 there's a comment in core.demangle that seems to say that some mangled=



 symbols are skipped because they are not pertinent to the ABI, or
 something to that effect. Meaning that *not* all symbols are getting
 demangled.

 I think this should be an enhancement request in the bugtracker.


Also, running this:

dmd test.d | demangle.exe -

on windows, results in this:

invalid UTF-8 sequence

Usage: demangle.exe [options] <inputfile>
Demangles all occurrences of mangled D symbols in the input and writes t=
o
standard output.
If <inputfile> is a single dash '-', standard input is read.
Options:
     --help, -h    Show this help

Adding writefln to demangle.d to debug the issue shows that args[1] is "=
-"  =

and that getopt is throwing the exception "invalid UTF-8 sequence".

Omitting the - works, and demangle reads stdin.

R

-- =

Using Opera's revolutionary email client: http://www.opera.com/mail/
Nov 01 2012
next sibling parent reply "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Thu, Nov 01, 2012 at 04:25:56PM -0000, Regan Heath wrote:

 On Thu, 01 Nov 2012 15:40:23 -0000, H. S. Teoh
 <hsteoh quickfur.ath.cx> wrote:
 

On Thu, Nov 01, 2012 at 03:16:25PM +0100, Dan wrote:

On Thursday, 11 October 2012 at 21:04:28 UTC, Alex Rønne Petersen
wrote:

On 11-10-2012 22:56, Sean Kelly wrote:








[...]

We even have a tool for that:
https://github.com/D-Programming-Language/tools/blob/master/ddemangle.d








[...]

 Also, running this:
 
 dmd test.d | demangle.exe -
 
 on windows, results in this:
 
 invalid UTF-8 sequence


[...]

 Omitting the - works, and demangle reads stdin.


[...]

https://github.com/D-Programming-Language/tools/pull/35


T

-- 
English has the lovely word "defenestrate", meaning "to execute by
throwing someone out a window", or more recently "to remove Windows from
a computer and replace it with something useful". :-) -- John Cowan
Nov 01 2012
parent "Regan Heath" <regan netmail.co.nz> writes:
On Thu, 01 Nov 2012 17:21:29 -0000, H. S. Teoh <hsteoh quickfur.ath.cx> =
 =

wrote:


 On Thu, Nov 01, 2012 at 04:25:56PM -0000, Regan Heath wrote:

 On Thu, 01 Nov 2012 15:40:23 -0000, H. S. Teoh
 <hsteoh quickfur.ath.cx> wrote:


On Thu, Nov 01, 2012 at 03:16:25PM +0100, Dan wrote:

On Thursday, 11 October 2012 at 21:04:28 UTC, Alex R=F8nne Petersen=









wrote:

On 11-10-2012 22:56, Sean Kelly wrote:








 [...]

We even have a tool for that:
https://github.com/D-Programming-Language/tools/blob/master/ddeman=










gle.d

 [...]

 Also, running this:

 dmd test.d | demangle.exe -

 on windows, results in this:

 invalid UTF-8 sequence


 [...]

 Omitting the - works, and demangle reads stdin.


 [...]

 https://github.com/D-Programming-Language/tools/pull/35


Perfect, thanks.

R

-- =

Using Opera's revolutionary email client: http://www.opera.com/mail/
Nov 01 2012
prev sibling parent "Regan Heath" <regan netmail.co.nz> writes:
On Thu, 01 Nov 2012 16:25:56 -0000, Regan Heath <regan netmail.co.nz>  
wrote:

 Adding writefln to demangle.d to debug the issue shows that args[1] is  
 "-" and that getopt is throwing the exception "invalid UTF-8 sequence".


I was wrong here, this line is the issue:
   stderr.writeln(e.msg);

For some reason, when run from command prompt and passed "-" as an arg it  
errors.

If I run it in debug mode in VisualD it works and outputs:
   Unrecognized option -

R

-- 
Using Opera's revolutionary email client: http://www.opera.com/mail/
Nov 01 2012
prev sibling parent "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Thu, Nov 01, 2012 at 08:40:23AM -0700, H. S. Teoh wrote:

 On Thu, Nov 01, 2012 at 03:16:25PM +0100, Dan wrote:

 On Thursday, 11 October 2012 at 21:04:28 UTC, Alex Rønne Petersen
 wrote:




[...]

We even have a tool for that:
https://github.com/D-Programming-Language/tools/blob/master/ddemangle.d


 
 Does this work and if so how? I've seen a thread about the
 demangling tool not working on types, just functions. The comment at
 top of this file says "Replaces *all* occurrences of mangled D
 symbols in the input..." so I assume it deals with types? The help
 says: 'If <inputfile> is a single dash '-', standard input is read.'


 [...]
 
 This program only calls the library core.demangle. So if core.demangle
 doesn't demangle something, then it won't get demangled. The problem
 is, there's a comment in core.demangle that seems to say that some
 mangled symbols are skipped because they are not pertinent to the ABI,
 or something to that effect. Meaning that *not* all symbols are
 getting demangled.
 
 I think this should be an enhancement request in the bugtracker.


[...]

I just looked over core.demangle. Apparently only function names are
demangled, everything else is currently not implemented. :-(  I say,
definitely file an enhancement request in the bugtracker.


T

-- 
The computer is only a tool. Unfortunately, so is the user. -- Armaphine, K5
Nov 01 2012